remove unused imports (again..)
certification check dialog also a fragment now, rotation-save
Replace icon for `add_to_calendar` action with nicer graphic.

+ Add `_dark` suffix to file name for being prepared for scheme switch.
read lecture start time with time zone, respect TZ for alarms, calendar entry
display the schedule in different timezones

remove unused import
Show error message when parsing of the schedule fails.
remove unused imports...
Merge pull request #9 from johnjohndoe/feature/pretty-up-add-to-calender-action-icon

Replace icon for `add_to_calendar` action with nicer graphic.
Merge pull request #14 from johnjohndoe/feature/handle-schedule-parsing-error

Show error message when parsing of the schedule fails.
fix actionbar in detail view for android 2.x
fix indeterminate progressbar for android 2.x