Implemented displaying found shortest path to selected animal.

Graph is now created during SplashActivity lifetime and stored in MyGuideApp.
Map in animal details view now by default displays area containing selected animal and user's position at maximum possible zoom.
Route starting point and animal location are connected with a pretty line.
Changed ViewPager settings so that MapFragment will now be active across all tabs.
Showing a dialog if location service is not available.
Showing a ProgressDialog when waiting for user's position.
Removed spammy log messages and decreased minimal interval between finding paths (90s -> 10s).
Merge pull request #83 from robin92/android

[MYGUIDE-235] Implemented displaying found shortest path to selected animal.