Use KitKat (19) as target sdk since robolectric 3.1.2/sqlite4java
does not understand "WITHOUT ROWID" tables.
Also, add constants for user's gender and document some things.
- moved out of GBApplication to class Logging
- the main thing is: when start()ing the FileAppender again, it *must*
- be configured to be non-lazy, otherwise it won't open the stream ever again.
The primary external dir is often a user-partition on the internal
storage medium. This one is safe in multi-user environments.
The "removable storage" (sdcard) on the other hand can be read by
everyone. If the former is not available or not writable, use the
latter.
closes#153
The notfification APIs now use NotificationSpec as their only parameter, which
contains all information (required and optional ones).
We no longer have separate methods and actions for SMS/EMAIL/GENERIC anymore.
The type of notification is important now, not how we received them technically.
