Travis setup, Footprint project type, bug fixes
This release contains:
- fixes project creation deriving invalid groups and overlaps #434
- smaller data size for footprint project type geometries using gzip #433 #405
- fix stats calculation for footprint project type #427
- solve "last screen shows only 3 cells" issue from front end side by making sure that groups always contain 6*x tasks #271
- travis deployment based on ansible for dev backend server