Report if a given style is a common style in the applied style summary

Consumers of the applied style summary information benefit from knowing
which common styles are applied to the given selection (e.g., so the
appropriate common paragraph & text styles can be selected in the UI).
Remove non-existent parameter from API dox
Merge pull request #341 from peitschie/common-styles

Report if a given style is a common style in the applied style summary
Add link to editor's welcome.odt (for webodf.org of course :) )
@returns -> @return
clickStartedWithinContainer -> clickStartedWithinCanvas
OdfCanvasAdapter -> MockOdfCanvas
Merge pull request #340 from kossebau/codeCleanups

Code cleanups (as seemed useful today)
Add tooltip support for hyperlink
Refactor HyperlinkClickHandler.js

* moved related event bindings from SessionController.js to HyperlinkClickHandler.js so bindings will be updated everytime the modifier is changed
* removed HyperlinkClickHandler.Modifier and use the KeyboardHandler.Modifier instead