setting selection color to user color with alpha of 0.4
- add hover information after highlighting
- set css class name for better global user specific highlighting in future (TODO)
- menu for editing highlighting
- some example highlighting functions
TODO:
- record audio
- move background-color of highlighting into (per user?) classes
- put highlight styles into some file
- add identifier classes to highlights to find subsequent highlights which belong together
- removage of highlights
Merge branch 'viewer' of https://github.com/winfel/wa_knowledge_structuring into viewer

Conflicts:
	source/objects/2.Viewer/view.js