onDeviceDropped: unit test, updating GATT server to be able to drop the
connection (by disabling the adapter), and initial Android implementation
GATT server: took out the useless console.log's. Woops.
Have unit tests connect to the closest (rssi) BlePluginSim (the
./_make/simulator GATT server), so multiple developers can work without
trampling on each others' Bluetooth adapters.
Get device dropped callback working.