Convenience function to create a client

Loads a config file at and creates a client according to various options. Handy IMO so you don't have to constantly look up your user key etc. Has some precedent in a similar system used by boto for AWS credentials (http://boto.readthedocs.org/en/latest/boto_config_tut.html)
I prefer to put imports at the top, see the [PEP8](http://legacy.python.org/dev/peps/pep-0008/#imports). It could also be `from ConfigParser import RawConfigParser`