Add serialization support
libpubnub/pubnub.h [serialization]: Improve function descriptions
[serialization]: Also keep the resume_on_reconnect flag
Merge branch 'master' into develop

Conflicts:
	tests/pubnubtest.cpp
PubnubTest [serialization]: Test a full URL at least once
[serialization]: Always generate the channels attribute, even if it's just []
[serialization]: Expand documentation on sanity assumptions
[serialization]: Expand documentation on what is and isn't serialized