[Android] BluetoothPlugin - Add connectInsecure() analogous to connect()

1. to allow unpaired/insecure connections to peripherials requiring so, such as some GPSes, Barcode Scanners, etc., see e.g. http://stackoverflow.com/questions/10986573/programmtically-connecting-to-a-bluetooth-enabled-barcode-scanner-in-android

2. As a last-effort workaround for well-known situation in ICS, where some devices will not work if paired, with Androids reauthentication failing, see e.g. http://code.google.com/p/android/issues/detail?id=34161 and http://stackoverflow.com/questions/11082819/bluetooth-connection-on-android-ics-not-possible