Merge pull request #83 from plepe/db-postgresql-as-base-class

Db postgresql as base class
DB/Overpass: bugfix, do not re-use variable
DB/Overpass: query for areas (multipolygons): include [type=multipolygon] condition
Misc/strip_includes: also accept 'ELSE'
Merge branch 'branch-0.10' into db-overpass
DB/Overpass: debug.profiler for overpass queries
DB/Overpass: queries for relations type=multipolygon also include type=boundary
DB/Overpass: if a relation is not a multipolygon, construct a geometry collection
DB/Overpass: bugfix, query overpass areas only for area-conditions
Merge branch 'db-overpass' into separate-loading-ways

Conflicts:
	pgmapcss/db/overpass/db_functions.py