CBL Android: Add release notes
CBL Android: Update getting started
CBL Android: update
Update release notes for libcouchbase 2.1.3
Updated gems to allow building on newest Mac OS.
Small changes to Node.js documentation.
CBL Android: fix code block formatting issues
Merge pull request #3 from avsej/release-notes-libcouchbase-2.1.3

Release notes libcouchbase 2.1.3
Merge pull request #4 from brett19/stage

Stage
CBL Android: clarify adding CBL to project