DB/Overpass: compiling queries, create dict with 'query'
DB/Overpass: compiling queries, return dict from conditions_to_query()
DB/Overpass: implement parent>child queries
DB/Overpass: collect parent queries in list to assign unique id
DB/Overpass: collect (parent-)queries in set to remove duplicates
DB/Overpass: get_bbox() returns only coordinates without [bbox:...]
DB/Overpass: parent queries also for members() and member_of()
DB/Overpass: when querying parent->child relations, add another BBOX query
DB/Overpass: enable more relationship queries

- way node
- node < way, member < relation
DB/Overpass: bugfix adding parent_queries for relations
Merge branch 'branch-0.10' into db-overpass-relationship

Conflicts:
	pgmapcss/db/overpass/db.py
	pgmapcss/db/overpass/db_functions.py
DB/Overpass: Bugfix, object_members/_member_of: add parent queries
Merge branch 'branch-0.10' into db-overpass-relationship
DB/Overpass: bugfix, handle parent conditions in convert_to_regexp
Merge pull request #94 from plepe/db-overpass-relationship

Db/Overpass: handle relationships in queries