[#81243156 #75668732 #83982732 #83854992 #83726270 #83832544]
* added description as for new client configuration method int README.md
* separated PubNub Objective-C client into separate project which is suitable for usage as static library (as standalone or dependency) or framework (standalone)
* fixed demo application channel information view
* adjusted client PNCannelGroup initialization code
* updated APNS demo application
* adjusted percent-encoding options
* updated information about source code base branch and commit SHA