Bug 1090689 - Add MPL2.0 headers to the repo
Merge pull request #279 from tojonmz/add-headers

Bug 1090689 - Add MPL2.0 headers to the repo
Bug 1090284 - Add a test to verify that the last push is cached
Bug 1091607 - Raise an exception when at least one TreeherderCollection fails to post data
Bug 1078239 - Fix bug suggestions for recently modified, resolved bugs

We divide bug suggestions for a search term into 'open_recent' and
'all_others'. The former is supposed to be group #1 below, and the
latter groups 2-4, with the summation of the two groups corresponding
to every bug whose summary matches the search term.

1) Open + recently modified
2) Open + not recently modified
3) Resolved + recently modified
4) Resolved + not recently modified

However prior to this patch group #3 was not being returned at all, when
it should have been included in all_others.