Added NODE_PG_FORCE_NATIVE to force usage of libpg bindings (native client)
Bugfix: safe call of .hasOwnProperty(...)
added test case for NODE_PG_FORCE_NATIVE
fixed wrong name for test file
fixed wrong name for test file ... again
remove modules from the cache & load test-helper
delete the entire module cache
Merge pull request #381 from hoegaarden/master

force usage of pg.native via environment variable