Add the beginning of support for query_relationship. It's mostly working; there are just
issues revolving not making it a DOS potential and for its usability (one wants to
hand lists of ids that we want to match against fields in the relationship, so we need
a good model for defining those calls).
added kbapi_common as a dependency
Stop reproducing the exact same code for every method
use requests instead of httplib & urllib2

still need to test that requests does the right thing via (self) signed
SSL certs

also clean up the exposed namespace
Merge branch 'dev-py-client' into dev-proto-py-client

Conflicts:
	DEPENDENCIES
use requests for getting token from globus
Merge branch 'dev-py-client' into dev-proto-py-client