Fix an image selection test had extra async: true
Added missing `async: true` to test helper example
manipulationTestHelper: more readable async example
manipulationTestHelper: semantic change in returning asyncResumeFunc
manipulationTestHelper: fail tests that specify async but do not call
Image selection test: more readable.
Unit tests: explain why we do not use fake timers.
Comment on pre-7 Triden'ts `mouseup` on an image.
Better comment for pre-7 Trident image selection
Merge branch 'selectImagesWithRangy' into dialogWindowTests
Dialogs tests: use sinon-qunit for spies auto unwrapping