Migrate and upstream BarcodeScanner

[timwindsor]

With version 2.0 of the BarcodeScanner, we can now better integrate with the PhoneGap plugin.

Destination repo is here: https://github.com/blackberry/BarcodeScanner

Source is here: https://github.com/blackberry/WebWorks-Community-APIs/tree/master/BB10-Cordova/BarcodeScanner

Planned upstream location is now: https://github.com/hypery2k/cordova-barcodescanner-plugin

• Need to migrate to use the same BarcodeScanner.js API as other platforms, with scan method
• Drop stopRead method
• Implement encode method (optional)
• Build in a newer version of the ZXing library instead of the on-device version.

[timwindsor]

Upstream is here: phonegap/phonegap-plugin-barcodescanner#32