NFCMessageBoard

Proof of concept for a localized message system.

It is quite simple, and does the job of reading and writing to any plain text
NFC tags. At a minimum you are recommended to use an NTAG216 that gives you
approximately 800 bytes of writeable memory.

It also has the advantage of being relatively private means of communicating
(even if it runs the issue of spoofing), since it is essentially a dead drop
system.

Potential Uses:

* Geo Cache GuestBook
* Ingress Local Message Store

Features:

* Reads Plain Text
* Write and prepends a message to a Plain Text Tag
* UTF-8 support, so can show emoticon.
* Links, email, map address are autolinked

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