Implement 1st step of CI/CD

[atsakiridis]

Investigate best CI/CD system out there (probably travis-ci since we're in Github) for android builds and configure it to build our code and see if we can integrate it with TestFairy for distribution.

Also investigate end-to-end test tools for android and see if we can get a very basic scenario working for this release. http://appium.io/ seems pretty promising, also see if we can integrate this with https://github.com/RestComm/webrtc-test

Also consider automatically generating reference doc

Here are the steps involved:

• [ ] Bring Simulator into shape
• [ ] Integration testing of RCDevice/RCConnection entities
• [ ] UI Testing
• [ ] CD: building
• [ ] CD: versioning (tagging in GitHub)
• [ ] CD: documentation

This is just an umbrella issue. Broken down actionable issues will be created

[atsakiridis]

Is already tracked in respective milestone