Let the Editor create its used div subtree itself

* use classes for styling of editor structures
* use namespaced, numbered element ids to allow more than one editor
Merge pull request #461 from kossebau/editorCreatesOwnDivs

Let the Editor create its divs itself
make Webodf version a global property on the new namespace webodf
Add about dialog to editor component
fixup about dialog version
no need for nested requires with aboutdialog

fixup for Add about dialog to editor component
remove even more unneeded code structures

fixup for Add about dialog to editor component
fixup aboutdialog ko logo as external file