Mode standalone: execute everything inside a transaction
PGCache: create template class + database table
Mode standalone::fake_plpy: execute() may not return rows (e.g. insert, delete)
PGCache: implement class
PGCache: example code
PGCache: documentation
PGCache: documentation
Merge pull request #84 from plepe/pgcache

PGCache: implement a cache using a database table
Merge branch 'branch-0.10' into db-overpass
DB/Overpass: bugfixes
DB/Overpass: re-implement objects_near() using PGCache