fixed PEP8 violation in config.py
removed PyPy specific imports from postgres.py adaptor as it is being handled in the parent scope of database.py
fixed postgres _shell not passing password to command
support for multiple database connections from a single mamba application, allow even to use different databases for different models
Merge pull request #84 from DamnWidget/master

Support for multiple database connections, resolved #76
fixed admin_script tests
disable slow command line tests by default
added mamba_database tests
Added support to fields and exclude when serializing to dict or json
Removed clutter and added parameters in the function docstring.