Added therubyracer dependency to be able to load less.
Add support for HTML5 multiple files upload

File input with multiple option should append [] to name.

See https://github.com/rails/rails/blob/3-2-stable/actionpack/lib/action_view/helpers/form_helper.rb#L1210
Merge pull request #988 from hooktstudios/file-field-multiple-html5

Add support for HTML5 multiple files upload.
Fix failing jruby test

- klass.to_s sometimes fails in jruby, if the klass is defined in java world
Merge pull request #991 from udzura/fix/patch-jruby

Fix failing jruby test
Merge pull request #986 from padrino/fix-less-dependencies

Added therubyracer dependency to be able to load less.