Adhering to Rails 3.1+ asset pipeline structure

According to the [asset pipeline rails
guide](http://guides.rubyonrails.org/asset_pipeline.html#asset-organization),
vendor javascripts and stylesheets belong in vendor/assets/javascripts
and vendor/assets/stylesheets.  This lets the asset pipeline include the
files by default.
Merge pull request #16 from cmaher/asset_pipeline

Adhering to Rails 3.1+ asset pipeline structure