Add pry
Add support to rails 4.1 and ruby 2.1.1
Merge pull request #96 from Ink/new-rails-ruby

New rails ruby
Don't modify url in #filepicker_image_url
Upgrading rspec so specs can pass again
Add filepicker_image_url to work with policies
Fix typo in application_helper_spec filename
Fix the default policy for filepicker_image_url

* Need read/convert, not pick/store.
* Only call the convert end point when CONVERT_OPTIONS are present.
* Don't mutate @url, just use functions.
Allow filepicker_image_url policy to be overridden

* Rails.application.config.filepicker_rails.policy_proc will be called
  to sign the URL.
* Defaults to read/convert.