nfc.fireTagEvent
js errors
windows phone 8 first pass
fix json for tag, note: decoded tag is still broken
fix reading ndef
handle longer records (sr=false), record ids and TNF_EMPTY
refactoring Ndef code to a separate class
clean up Ndef, add NfcTag
Merge pull request #56 from don/windows-phone-8

Windows Phone 8
Switch BB10 from tag event to ndef event fixes #55
Merge pull request #60 from don/bb10-ndef-vs-tag

Switch BB10 from tag event to ndef event fixes #55