Starting to straighten up the current look & feel.

Fixes:
- CSS-Issue with lists in our input-area (also within a list)
- Inflationary usage of yellow lines, especially in our timeline-view
- Input-Areas got proper old-school styling
- A note in the timeline looks now more like an area (rather than a vast group of elements)
- Adjusted some paddings

Pending:
- wrap lower toolbar into a div (in note-timeline-view)
- improve add-tag dialog (in note-timeline-view)
- consolidate styling of links (hrefs) and buttons (clicks)
- load more posts automatically
- when going back into timeline (from detail view) jump into previous page
  (also add "load newer posts")
- tag-filter-view, login-menu and user-menu still interfere
  (if screen-width is not so wide needs revision)
- Redo Header Layout (Add logo and support IE9, Opera)
- Fix adding multi-paged (a.k.a. very long) notes in timeline-view
- move more edit-related functions into a more private scope
- commit changes from here also into the ck-mathjax repository

Note:
Installation depends on DeepaMehta 4.1.1-SNAPSHOT as of commit:
ca61964a27e6757848e638c3bafc9374c6aff45c

Documentation:
https://www.eduzen.tu-berlin.de/software-komponenten (German)
https://www.eduzen.tu-berlin.de/zur-notizen-webanwendung (German / Get User Account)
Merge branch 'first-design'