Add description of gem.

Replaces TODO.
Update rickshaw.{js,css} to v1.4.3.
Merge pull request #5 from phillbaker/feature/update-v1.4.3

Update rickshaw.{js,css} to v1.4.3.
Merge pull request #4 from phillbaker/master

Add description of gem for README
update rickshaw version and move files to app for rails 4 compatibility
small fix in gemspec
add authorship
bump to version 1.4.5
Merge pull request #6 from maxcal/update-to-1.4.5

bump to version 1.4.5
license
Merge pull request #8 from grosser/license2

license