automatically set precompile assets
remove some images

remove some images from app/assets/images/active_admin which has no reference in the code base
remove doubled let namespace in register_resource_spec
change PunditAdapter to work with method_missing
remove old formtastic css class and add new ones
refactor DownloadFormatLinksHelper
remove js window.AA
simplify AA::Devise.config

Devise has `sign_out_via` since v1.2.0 (ab7f3bc1757104c053d3e3c9bf6db2de03dee830), and we have a min (soft) dependency to v3.2.x https://github.com/activeadmin/activeadmin/blob/master/lib/active_admin/dependency.rb#L3
fix gitignore for localeapp
simplify gemspec
fix gemspec for ruby 1.9
fix favicon namespace
Bump the rails versions on travis.yml to the latest
Merge pull request #3639 from strivedi183/bump_rails_latest_travis

Bump the rails versions on travis.yml to the latest
Merge pull request #3638 from kissrobber/favicon_namespace

fix favicon namespace
Merge pull request #3587 from activeadmin/refactor_download_format_links_helper

refactor DownloadFormatLinksHelper
Adding Gotchas document with information regarding Sprockets and session committing
Merge pull request #3632 from nick-desteffen/master

Adding Gotchas document
Fix linter errors

* Removed duplicated newlines
* Replaces ASCII Chars
Replaces datepicker images with css, uses bourbon for gradient, and set colors from variables file