Update for 4.0
Fix readme, add dependency badge, fix travis.yml
Fix dependencies
Fix travis
Fix readme
Add IDEA and Gemfile.lock to ignored
Fix gemspec
Fix tests
Fix for 4.0
Loosen rails version dependency to allow rails 4.1
Fix compatibility with Rails 4.1.0

The changes should be backwards compatible, but have not yet been tested
with older versions of Rails.
Restore compatibility with Rails 3.2
Update README and gemspec
Remove jquery-rails development dependency
Add rails 3.2/4.0/4.1 to travis build matrix
Restore original author info/urls for PR