Updated readme

This is a kind of test of the way branches are working with the Github
desktop client.
Readme updated

Updated readme for the goal of 1.2.0.1 : BBM support is the main
objective.
Adding BBM registration and send invite message
UI improvements

- EV toggle is now stored in the settings
- Invite to download button is now grayed if BBM not connected.
Merge pull request #2 from gaeljaffrain/bbm

Bbm