Merge pull request #4 from dleeMozilla/b2g

Bug 934838 - NFC Daemon code should define a more clear interface for vendor specific code
Merge pull request #5 from dleeMozilla/b2g

Bug 939450 - B2G NFC: nfcd does not handle handover protocol correctly
Merge pull request #6 from dleeMozilla/b2g

Bug 940858 - B2G NFC: NFC Daemon should send handover select response th...
Bug 941433 - NFC Daemon could not detect tag