am ed2a70d6: docs: add the Bluetooth developer guide, and make some revisions to the BT javadocs

Merge commit 'ed2a70d6495b3f1928e36ad2b00ee4d33b2c0379' into eclair-mr2

* commit 'ed2a70d6495b3f1928e36ad2b00ee4d33b2c0379':
  docs: add the Bluetooth developer guide,