Implement "sending" the SDP offer
Issue-Id: #9
Make sub-suites to group tests for each function
PeerConnectionWrapperTest: rename variable pc -> pcw
Implement createAnswer callback in PeerConnectionWrapper.sendOffer()
Issue-Id: #9
PeerConnectionWrapperTest: remove redundant words in test names
PeerConnectionWrapperTest: refactor signalIceCandidate tests
Implement "sending" the SDP answer
Issue-Id: #9
Implement data channel setup
Issue-Id: #9
Implement sending/receiving messages
Issue-Id: #12
Issue-Id: #13
Implement connecting peers
Issue-Id: #9