Merge pull request #26 from faph/feature_growthcurve

Feature growthcurve
Merge pull request #27 from faph/feature_growthcurve

doc updates
Merge pull request #28 from faph/feature_growthcurve

doc updates
Merge pull request #29 from faph/feature_growthcurve

Fixes to growth curve location parameter
Removed `cds_comments` attribute in `entities.Catchment` as there is already a `comments` attribute.
encoding and blank line at end
Merge pull request #30 from faph/feature_entities_fixes

Feature entities fixes
Merge branch 'master' into feature_growthcurve