can set minimum app version. api filters out errors with app-version less than this amount. filtering only happens if both min_app_version and app-version are set.
changed names and logic of should_keep? to match kb article http://help.airbrake.io/kb/ios/app-versions
add tests for ErrorReport#should_keep?
Merge pull request #621 from CruGlobal/issue-621

Ignore errors reported from old versions of an app
Submit buttons cursor pointer
Merge pull request #635 from skv-headless/master

Submit buttons cursor pointer
Internet Explorer 6 complains

Internet Explorer 6 complains when you add commas to the end of a list.
Merge pull request #638 from svenwin/master

Internet Explorer 6 complains about commas
Updated err bit repository url in config example

github repository is not working with http
Merge pull request #639 from marciotoze/patch-1

Updated errbit repository url in config example
Give admins the ability to destroy all problems associated with an app
Use asset_path helper for images in css.

This means that in a production environment the images will use a
digested filename.  We can therefore safely set far-future expires
headers for them.
Merge pull request #641 from alphagov/fix_assets

Use asset_path helper for images in css.
Allow users of a specific GitHub organization to login
Merge pull request #644 from pyro2927/feature/github_org_auth

Allow users of a specific GitHub organization to login
Small refactoring
Adding documentation for GITHUB_ORG_ID
Merge pull request #645 from pyro2927/feature/github_org_auth

Adding documentation for GITHUB_ORG_ID
Support GitHub Enterprise repository links

Let companies or groups that run their own GitHub Enterprise installs be
able to link their own repositories.

That's the case with our company and we can't easily link the internal
repositories.
correct app flash messages