For Travis CI - attempt to fix 32-bit CI build. Skip Android SDK.
Only signal work items that have specified or higher priority in WorkQueue::Complete(), to prevent lower priority work item events triggering when they shouldn't (in the middle of render update.) Set explicit max priority in Octree & View items, but leave default priority to the lowest for user items. Removed a static variable from WorkQueue::PurgePool().
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Source/Engine/Core/WorkQueue.cpp