Add space between numbers and units in README, package documentation.

When we added space between numbers and units in 64dbdae0d393b7d71480a6dace78456396b55286,
the README and package documentation weren't updated. This fixes that.

Also fix various other minor issues in documentation that I found.
Use single space between sentences in README, to follow Go style.

Follows 64dbdae0d393b7d71480a6dace78456396b55286.
Helps #21.
diff --git a/README.markdown b/README.markdown
index 23dfee0..f69d3c8 100644
--- a/README.markdown
+++ b/README.markdown
@@ -3,7 +3,7 @@
 Just a few functions for helping humanize times and sizes.
 
 `go get` it as `github.com/dustin/go-humanize`, import it as
-`"github.com/dustin/go-humanize"`, use it as `humanize`
+`"github.com/dustin/go-humanize"`, use it as `humanize`.
 
 See [godoc](https://godoc.org/github.com/dustin/go-humanize) for
 complete documentation.
@@ -11,12 +11,12 @@
 ## Sizes
 
 This lets you take numbers like `82854982` and convert them to useful
-strings like, `83MB` or `79MiB` (whichever you prefer).
+strings like, `83 MB` or `79 MiB` (whichever you prefer).
 
 Example:
 
 ```go
-fmt.Printf("That file is %s.", humanize.Bytes(82854982))
+fmt.Printf("That file is %s.", humanize.Bytes(82854982)) // That file is 83 MB.
 ```
 
 ## Times
@@ -27,11 +27,11 @@
 Example:
 
 ```go
-fmt.Printf("This was touched %s", humanize.Time(someTimeInstance))
+fmt.Printf("This was touched %s.", humanize.Time(someTimeInstance)) // This was touched 7 hours ago.
 ```
 
 Thanks to Kyle Lemons for the time implementation from an IRC
-conversation one day.  It's pretty neat.
+conversation one day. It's pretty neat.
 
 ## Ordinals
 
@@ -48,12 +48,12 @@
 Example:
 
 ```go
-fmt.Printf("You're my %s best friend.", humanize.Ordinal(193))
+fmt.Printf("You're my %s best friend.", humanize.Ordinal(193)) // You are my 193rd best friend.
 ```
 
 ## Commas
 
-Want to shove commas into numbers?  Be my guest.
+Want to shove commas into numbers? Be my guest.
 
     0 -> 0
     100 -> 100
@@ -64,7 +64,7 @@
 Example:
 
 ```go
-fmt.Printf("You owe $%s.\n", humanize.Comma(6582491))
+fmt.Printf("You owe $%s.\n", humanize.Comma(6582491)) // You owe $6,582,491.
 ```
 
 ## Ftoa
@@ -72,10 +72,10 @@
 Nicer float64 formatter that removes trailing zeros.
 
 ```go
-fmt.Printf("%f", 2.24)                   // 2.240000
-fmt.Printf("%s", humanize.Ftoa(2.24))    // 2.24
-fmt.Printf("%f", 2.0)                    // 2.000000
-fmt.Printf("%s", humanize.Ftoa(2.0))     // 2
+fmt.Printf("%f", 2.24)                // 2.240000
+fmt.Printf("%s", humanize.Ftoa(2.24)) // 2.24
+fmt.Printf("%f", 2.0)                 // 2.000000
+fmt.Printf("%s", humanize.Ftoa(2.0))  // 2
 ```
 
 ## SI notation
@@ -85,7 +85,7 @@
 Example:
 
 ```go
-humanize.SI(0.00000000223, "M")    // 2.23nM
+humanize.SI(0.00000000223, "M") // 2.23 nM
 ```
 
 [odisc]: https://groups.google.com/d/topic/golang-nuts/l8NhI74jl-4/discussion
diff --git a/bigbytes.go b/bigbytes.go
index d4fb371..1a2bf61 100644
--- a/bigbytes.go
+++ b/bigbytes.go
@@ -113,7 +113,7 @@
 //
 // See also: ParseBigBytes.
 //
-// BigBytes(82854982) -> 83MB
+// BigBytes(82854982) -> 83 MB
 func BigBytes(s *big.Int) string {
 	sizes := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
 	return humanateBigBytes(s, bigSIExp, sizes)
@@ -123,7 +123,7 @@
 //
 // See also: ParseBigBytes.
 //
-// BigIBytes(82854982) -> 79MiB
+// BigIBytes(82854982) -> 79 MiB
 func BigIBytes(s *big.Int) string {
 	sizes := []string{"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"}
 	return humanateBigBytes(s, bigIECExp, sizes)
@@ -134,8 +134,8 @@
 //
 // See also: BigBytes, BigIBytes.
 //
-// ParseBigBytes("42MB") -> 42000000, nil
-// ParseBigBytes("42mib") -> 44040192, nil
+// ParseBigBytes("42 MB") -> 42000000, nil
+// ParseBigBytes("42 mib") -> 44040192, nil
 func ParseBigBytes(s string) (*big.Int, error) {
 	lastDigit := 0
 	hasComma := false
diff --git a/bytes.go b/bytes.go
index 190ab65..0b498f4 100644
--- a/bytes.go
+++ b/bytes.go
@@ -84,7 +84,7 @@
 //
 // See also: ParseBytes.
 //
-// Bytes(82854982) -> 83MB
+// Bytes(82854982) -> 83 MB
 func Bytes(s uint64) string {
 	sizes := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB"}
 	return humanateBytes(s, 1000, sizes)
@@ -94,7 +94,7 @@
 //
 // See also: ParseBytes.
 //
-// IBytes(82854982) -> 79MiB
+// IBytes(82854982) -> 79 MiB
 func IBytes(s uint64) string {
 	sizes := []string{"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"}
 	return humanateBytes(s, 1024, sizes)
@@ -105,8 +105,8 @@
 //
 // See Also: Bytes, IBytes.
 //
-// ParseBytes("42MB") -> 42000000, nil
-// ParseBytes("42mib") -> 44040192, nil
+// ParseBytes("42 MB") -> 42000000, nil
+// ParseBytes("42 mib") -> 44040192, nil
 func ParseBytes(s string) (uint64, error) {
 	lastDigit := 0
 	hasComma := false
diff --git a/humanize.go b/humanize.go
index a69540a..a2c2da3 100644
--- a/humanize.go
+++ b/humanize.go
@@ -2,7 +2,7 @@
 Package humanize converts boring ugly numbers to human-friendly strings and back.
 
 Durations can be turned into strings such as "3 days ago", numbers
-representing sizes like 82854982 into useful strings like, "83MB" or
-"79MiB" (whichever you prefer).
+representing sizes like 82854982 into useful strings like, "83 MB" or
+"79 MiB" (whichever you prefer).
 */
 package humanize
diff --git a/si.go b/si.go
index 9cce4e8..b24e481 100644
--- a/si.go
+++ b/si.go
@@ -68,7 +68,7 @@
 	value := mag / math.Pow(10, exponent)
 
 	// Handle special case where value is exactly 1000.0
-	// Should return 1M instead of 1000k
+	// Should return 1 M instead of 1000 k
 	if value == 1000.0 {
 		exponent += 3
 		value = mag / math.Pow(10, exponent)
@@ -86,8 +86,8 @@
 //
 // See also: ComputeSI, ParseSI.
 //
-// e.g. SI(1000000, B) -> 1MB
-// e.g. SI(2.2345e-12, "F") -> 2.2345pF
+// e.g. SI(1000000, "B") -> 1 MB
+// e.g. SI(2.2345e-12, "F") -> 2.2345 pF
 func SI(input float64, unit string) string {
 	value, prefix := ComputeSI(input)
 	return Ftoa(value) + " " + prefix + unit
@@ -99,7 +99,7 @@
 //
 // See also: SI, ComputeSI.
 //
-// e.g. ParseSI(2.2345pF) -> (2.2345e-12, "F", nil)
+// e.g. ParseSI("2.2345 pF") -> (2.2345e-12, "F", nil)
 func ParseSI(input string) (float64, string, error) {
 	found := riParseRegex.FindStringSubmatch(input)
 	if len(found) != 4 {