Fix compatibility of new badge firmware version (3.0)

Merge pull request #33 from HumanDynamics/fix/new-firmware

Accept zero voltage in headers
Fixed #32

Bugfix - mobile app no longer re-sends completed meetings

This is part of a fix that prevents the mobile app from re-sending completed meetings

Update comm. protocol + Android 6.0 support

App sometimes had issues with Android 6
Badges now send proximity date
Badges now use a different advertisement

Projects instead of groups

2.0

Undo change to disableBluetooth(). I still dont know why we do this, …

RoundTable: Debuggable Sloan

Plugins will now default to choosing the correct version to install.

RoundTable: Sloan Edition

The version of the phone app used by members of the Sloan Fellows program in Summer 2016.

Uses a Group -> Member structure with a one to one relation between Groups and Hubs.