Adding Beta 2 Mac installer issue to release notes

Referring to issue https://github.com/couchbase/sync_gateway/issues/220
Updating to latest version of public Stage
Updating to latest Stage branch
Beta 2 Release Notes for Android

Fixing a bit of Beta 1 and adding Beta 2 release notes for Android
Merge pull request #77 from JessicaCB/stage

Beta 2 Release Notes for Android