Map performance improvements.

- Doing Asynctask to get create the cluster item instead of doing it in main thread.
- Also doing a center crop on images so that they don't distort in map marker icon as it is a square.
Map performance improvements.

- Doing Asynctask to get create the cluster item instead of doing it in main thread.
- Also doing a center crop on images so that they don't distort in map marker icon as it is a square.
Merge branch 'map_fixes' of https://github.com/Hawk-It/HawkItAndroidApp into map_fixes
Merge pull request #128 from Hawk-It/map_fixes

Map fixes