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?
call old onerror when it's already defined
Merge pull request #621 from CruGlobal/issue-621

Ignore errors reported from old versions of an app
Added New Relic support
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