JIDs without resources will return '' instead of the bare JID. Cleaned up JID tests, and added check_JID to SleekTest.
Moved SleekTest to sleekxmpp.test. Organized test suites by their focus. - Suites focused on testing stanza objects are named test_stanza_X.py - Suites focused on testing stream behavior are name test_stream_X.py
Fixed some tabs/spaces issues.