improved .gitignore

- exclude Eclipse files
- exclude Android files
added preference for notifications
implemented simple notifications

Simple notifications using AlarmManager
improved notification layout

-added costum title/content
-added sound and vibration + settings
-added SmallIcon
improved notification alarm

-alarm is set during party creation
-data is read directly from party file
-notifications are updated at shiftstart
-notifications are canceled at party end
fixed alarm bug

-Pending intent gets an unique ID
added action buttons to notifications
applied gitignore
finished notification feature

-reation to action buttons not possible with current architecture