catchment collections: by number and nearest
fixed tests
QMED analysis automatically searched for nearest donor station
Tutorial
Fixed loading catchment without amax file
Merge branch 'develop' into feature_collections

Conflicts:
	floodestimation/db.py
encoding info
fixed file not found error
fixed file not found error and doc updates
doc updates
Merge pull request #22 from faph/feature_collections

Feature collections