remove err check since it's not possible
bug fix and more tests
Merge branch 'conferernce_tests' of https://github.com/natebrennand/twilio-go into conferernce_tests
adding filter for participant list
Merge pull request #67 from natebrennand/conferernce_tests

Conference tests
Merge branch 'master' of https://github.com/natebrennand/twilio-go into sip
adding credential list + fixtures