Google Analytics pluging final

All these tests passed.
- initializing, and set/get all properties
- tracking without using queue/storage
- using queue/storage
- storing & retrieving previous session's UUID
- start with active connection, deactivate connection then send tracking requests & store data
- start with no active connection & store data
- start with no active connection and re-activate connection to re-send data
- start with no active connection, quit & restart to retrieve & re-send data