Merge pull request #1 from cgooley/master

Fix filename support
Version bump to 0.2.0.
Update CHANGELOG.md
Changed some internals.
Updated README.md.
Test more on Travis.
Less parantheses.
Merge branch 'master' into rails4
Rails 4 compatibility!
Fixes Gemfile.
Addes Travis badge! [ci skip]
Bump to 0.3.0