Initital support for alternative database types
DB: add support for osmosis pgsnapshop schema (not finished)
Main: set mode of compilation (database-function/standalone)
Create pgmapcss.mode; move header and footer from compiler
pgmapcss.mode: standalone, header/footer. need fix: indentation
pgmapcss.mode: remove __init__.py
pgmapcss.mode: fix indentation
Mode standalone: insert database connection options from arguments
Mode Standalone: return python values (e.g. dict instead of hstore)
Mode standalone: parse arguments; argument bounds
Mode standalone: pass scale denominator as argument
Mode standalone: print json output (not geojson!)
Mode Standalone: print notice/warning to stderr
Merge branch 'standalone' into tagchecker
Merge remote-tracking branch 'origin/osmosis-pgsnapshot' into tagchecker