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?
Fix Redmine repository links

Previously the link would point to the revision overview, where the line
number in the urlmakes no sense. Now it shows the file a t the proper line.
One can still switch to the changes from there with one click.
Merge pull request #629 from felixbuenemann

Fix Redmine repository links

[fixes #591]
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
set mail delivery method to sendmail
ruby-version, for real