Concentrate execCommand constants.

Conflicts:
	src/wymeditor/core.js
	src/wymeditor/editor/base.js
	src/wymeditor/editor/webkit.js
editor.link and editor.insertImage
Remove registerChange calls that came from the future.
Link and image dialogs use editor.link and editor.insertImage

Conflicts:
	src/wymeditor/core.js
New image tests.

Conflicts:
	src/test/unit/test.js
New link tests.
Fix: image tests were not really added to test suite.

Conflicts:
	src/test/unit/index.html
Fix: link tests were not really added to test suite.
Allow images in the body.
Fix testWym -> testWymManipulation in link and image tests.
Make jshint happy in test.js
Add some attributes to the tests normalizer whitelist.
Fix _selected image is saved on mousedown test.
PhantomJS `.Apple-style-span`s are removed after image insertion.

Conflicts:
	src/wymeditor/editor/base.js
Fix error in image test name.
Fix code comment error in image test.
Fix indentation in webkit.js
Fix image insertion in the body test for IE7.
Merge branch 'manipulationTestHelper' into imageAndLink
Link and image tests use manipulationTestHelper.