Merge changes from origin/7.1

Merge changes from origin/7.1

c7ae45c Validate that the connector is enabled before triggering actions for it (#12743)
ce89a75 Created constants for tested browser versions (#12786)
f9ea9b3 Allow running tests locally by overriding runLocally() (#12786)
e70ba25 Added liferay module for building liferay.zip #12748
7c12694 Add sub directory support to sass test scanner (#12790)
39fdf66 Handle numbers in the same way if they do not have a unit (#12732)
6155d61 Disable fallback in a way compatible with Atmosphere JS 2.0.3 (#12241)
f401595 Test for pushing large chunks of data (#12567)
d41967d Skip compilation of TB2 tests if tests.tb2.skip is set
6c1ba81 Reverted button click() logic check (#12743)
779c8a0 Disable automated testing on Opera until issues are resolved (#12487, #12367, #12800)
962c1c3 Fix compilation error
7ee11a7 Remove unused test super class (#12786)
a4211dc Resolve concurrency issue in running TB3 tests
20c28aa Fixed javadoc
0d36896 Add more hax to make test work with new Atmosphere JS (#12241)
ed50200 Fix serialization issue (#12703)
dd51b7f Added more exception handling to PushHandler (#12578, #11882)
6f76840 Sass variables can now start with underscore (#12716)
ab5b20c Ticket #12727 - Panels get unnecessary scroll bars in WebKit when content is 100% wide.
361ad17 Fixed focus issue in TableMoveFocusWithSelectionTest (#12540)
ee809e5 Revert broken fix and test (#12446)

Change-Id: I71b6e3c2dc6b02845794df0934ba807d7ccac784