0.9.0

Pull requests

Fix pylint (#1544)
fix NZ exchange (#1546)
fix minor mistake in statnett.py (#1547)
Fix datetime parse (#1548)
SV: Add RU-1 and RU-2 (#1549)
changed console error to warn in dataReducers (#1552)
Create Mexican exchanges (#1512)
Add missing zone names for India (#1556)

No stand-alone commits.