Add nfc.enabled for Settings UI and Enable/Disable airplane mode.
Fixes for review comments in NFC dom implementation.
MozNFCTag DOM object implements NDEF Tag interface.
Nfc: Implement binary protocol using worker_buf lib
Fix settings enabled setting. Also, set DEBUG variable to false.
Add MozNFCTag connect with enum type.
Fix missing parameter in writeNDEF.
Move Session Management logic from Content to Chrome process
Merge branch 'master' of ssh://github.com/svic/mozilla-central into master_new1

Conflicts:
	dom/nfc/MozNFCTag.js
	dom/system/gonk/Nfc.js
	dom/system/gonk/NfcContentHelper.js
Fixed Session ID / Token handling in parent process
Merge branch 'master_new1' into spinning_wheel_bin

Conflicts:
	dom/system/gonk/Nfc.js
	dom/system/gonk/NfcContentHelper.js
	dom/system/gonk/nfc_worker.js