Merge pull request #16 from riddlore/master

modul selection for plan
Some style changes.
Fix for  Issue #17.
Adding admin link to menubar.
Merge https://github.com/riddlore/InterTime #18
Added list_filters.
Using semester__name.
Updated timer, fix for #15.
Migration for Modul.number = null.
Updated IFIws13 parser for #15.
list function, not full working
js fix for sel/desel moduls
fix delete function, but still doesn't full working

does not remove all elements