Alter `html()` documentation.
Merge pull request #623 from wymeditor/testWymManipulationRawHtml

Use `rawHtml` in `testWymManipulation`
Merge pull request #620 from wymeditor/noPrepareDocInRawHtml

`rawHtml` shouldn't call `prepareDocForEditing`
Merge pull request #622 from wymeditor/firefoxKeepDesignModeOn

Gecko keeps designMode on during HTML insertion
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.