Close #469 Add GStreamer state tests

Add 3 test cases to test GStreamer states: record, pause, and stop

test_current_state_is_record(): checks that the current state is RECORD
test_current_state_is_pause(): checks that the current state is PAUSED
test_current_state_is_not_stop(): sets state to null, then checks that
current state is not STOP

Related #437
Remove framework/rss_parser.py
Close #506 Add rss feed attribute tests
Add a test that pulls different rss feed attributes such as title, speaker, etc.

test_get_presentations(): pulls attributes title, speaker, level,
status, time, event and room and checks that they contain
correct values