Bug 976402 - Part 1 - Do not register target if the sessionTokens do not match. r=allstars.chh
Bug 976402 - Part 3 - Add marionette test case to validate  access to MozNfcPeer interface with invalid sessionToken. r=allstars.chh
Bug 976402 - Part 2 - Throw an error when sessionToken is incorrect while using the interfaces getNFCTag() and getNFCPeer(). r=smaug