Bug 903250 : Support sharing of URLs; r=reviews.

Bug 903250 : Support sharing of URLs; r=reviews. 
1.The constant are URI Record Type Definition. These are mapped to URI string prefixies.
URI Identifier code and URL data transfer via NFC
2. All Handler function are changed from Browser to NFC and Code kept in the nfc.js
3. String utility moved into utilities.js
4. gjslint build error is verified
5. Variables are camelCase