Merge pull request #1 from fasterhorses/master

Made WPM a parameter; corrected grammar
Changed round function, added different styles

As suggested by others, round function is more appropriate. And I added
different styles, turning my "English grammar bug" into a feature ;)
Markdown madness in Readme file
Too early to write a Readme file
*yawn*
Today's not the right day for updating readme files...
Added "extended style", updated readme file
Updated to version 0.2

- Added the 'format' parameter, which allows you to pick either an alpha or numeric version of readingtime
- Added the 'custom' parameter, which allows you to enter any string you want. This parameter will replace '#' with the reading time.
- Updated README