Add Appraisal
Fix specs to run on rails 3.2.x

The rails 4 inputs are like:

<input data-fp-apikey=\"123filepickerapikey\" id=\"user_filepicker_url\" name=\"user[filepicker_url]\" type=\"filepicker\" />

when the rails 3.2.x are like:

<input data-fp-apikey=\"123filepickerapikey\" id=\"user_filepicker_url\" name=\"user[filepicker_url]\" size=\"30\" type=\"filepicker\" />

The difference is the size attribute. So you can no more match against a complete tag if we support both rails on specs. So change the specs to match against single attributes
Add 3.2 and 4.0 gemfiles on Travis
Add info on Changelog
Merge pull request #79 from maurogeorge/appraisals

Running specs on rails 3.2.x and 4.0