Add NFC pairing
Updated to bitcoinj-0.11.3.
Possible solution to "Package file was not signed correctly."
Added contributions list to About and README.
Merge pull request #19 from haraldh/nfc

Add NFC pairing
Added instructions for NFC pairing.
Version 0.3.9
Merge branch 'master' into bitcoinj-hdw

Conflicts:
	TODO.md
	pom.xml