Merge pull request #868 from erikvold/852217

Bug 852217: adding more tests to a failing pb testaddon to get more information on the issue r=@ZER0
Bug 852217: adding test titles to pages opened in selection pb tests and focusing the test window before testing the selection value
Merge pull request #869 from erikvold/852217p2

Bug 852217: adding test titles to pages opened in selection pb tests and focusing the test window before testing the selection value @r=ZER0
Bug 851163: Log a tbpl message for exceptions from the main test functions. r=ochameau
Bug 852217 - private browsing testaddon test failures

- Displayed title for the tabs that are not supposed to be opened during tests
- Forced the window's focus before executes selection tests.
Merge pull request #870 from ZER0/private-test-failures/852217

Bug 852217 - private browsing testaddon test failures r=@erikvold
Bug 852217: focus opened windows in pb tests of pb test addon
Merge pull request #871 from erikvold/852217p3

Bug 852217: focus opened windows in pb tests of pb test addon @r=ZER0
Bug 836471 - update documentation for per-window private-browsing; r=@erikvold
Merge pull request #872 from wbamberg/836471-2

Bug 836471 - update documentation for per-window private-browsing; r=@erikvold
Fix bug 819578, Default styles in panels should only be applied once
a=@gozala
Merge pull request #873 from jsantell/apply-panel-style-once-819578

Fix bug 819578, Default styles in panels should only be applied once, a=@gozala
Fix leaks in the frame utils.
Bug 843823 - document last-pb-context-exited event in private-browsing module
Write hidden frame tests against leaks.
Merge pull request #833 from ochameau/cfx-init-tests

Bug 847833 - Add test against `cfx init`. r=@gozala
Bug 843438 - ignore private tabs on fennec when there is no private-browsing permission
Fix bug 833171 - system/events example needs to be a strong reference
Fix bug 843823 - Fix the last-pb-context-exited example in the documentation
Merge pull request #878 from KWierso/843823

Fix bug 843823 - Document last-pb-context-exited event in private browsing module r=@erikvold