minor changes + re-entrant session + file moving

session now expires in one week
new landing page
Merge pull request #150 from leider/master

Viel Layouting und persistente Session / Cookie
First shot for calendar in sidebar
refactoring
extracted activity validation
Calendar almost final

!!! Activity DB format changed !!! Drop the collection in mongo
color and text formatting and minor tweaks in calendar
now we have restart persistent sessions!
Merge pull request #152 from leider/Calendar

A real huge pull request with lots of stuff
persistente session temporaer raus
sometimes I HATE it and me
AAAAARRRRGGGHHHH
Merge pull request #153 from leider/master

dann eben nicht
good old rule:

as soon as you do it right, it works!
hotfix
Merge pull request #154 from leider/master

Jetzt sollte es klappen