Should fix wrong times with EventDates

commit 2b74a33b8563db5e75cf2a54b4b9f3138114c6e5
Merge: 9fce11d 3d4cb62
Author: Carsten Griesheimer <hallo@carstengriesheimer.de>
Date:   Wed Jun 12 17:17:31 2013 +0200

    Fix wrong times

    Conflicts:
    	app/models/event_date.rb
    	db/migrate/20130611122223_correct_timezones.rb
    	lib/week_timetable/event_date_proxy.rb

commit 3d4cb62b6bb068d70fcd0209d30628c735f024f0
Author: Carsten Griesheimer <hallo@carstengriesheimer.de>
Date:   Wed Jun 12 17:13:37 2013 +0200

    EventDates have a wrong timezone. This should fix it.

commit 9fce11d219a86a00d52c8e6bf2d67ad8e4f3e205
Author: Carsten Griesheimer <hallo@carstengriesheimer.de>
Date:   Tue Jun 11 14:31:20 2013 +0200

    EventDates have a wrong timezone. This should fix it.