bug 899849 - fix MozbuildObject.from_environment to work right when no mozconfig specified. r=gps
bug 893785 - don't fire gamepadconnected events for windows that have already received them. r=smaug

--HG--
rename : dom/tests/mochitest/gamepad/test_gamepad_hidden_frame.html => dom/tests/mochitest/gamepad/test_gamepad_connect_events.html
Bug 899834 (attempt 2) - Use a better hash function for the atoms table.  r=luke.

--HG--
extra : rebase_source : 8de314d19777ec380c8a4462b04563d77879526f