Merge pull request #627 from wymeditor/manipulationTestHelper

manipulation test helper doesn't wrap test()
Name style changes in image and link tests.
Code comment changes in EXEC_COMMAND constants.
Typo in exception message in editor.link
Remove handling of old gecko designMode disable bug
manipulationTestHelper: add option to skip test.

Conflicts:
	src/test/unit/utils.js
Correct expectancy in manipulationTestHelper
testWymManipulation Document skipFunc console warning.
Fix manipulationTestHelper docstring.
Fix warning when manipulationTestHelper skipped.
Merge branch 'skipFunc' into
geckoFocusResetDesignmodeBug
Fix manipulationTestHelper skip warning.
Merge branch 'skipFunc' into geckoFocusResetDesignmodeBug
Fix syntax error.
Merge branch 'skipFunc' into geckoFocusResetDesignmodeBug
Handle zero expectation in manipulationTestHelper skipping
Merge branch 'skipFunc' into geckoFocusResetDesignmodeBug
Core test: Focusing on document triggers designMode if it is off
Slightly improve _isDesignModeOn
Add _enableDesignModeOnDocument.