Merge pull request #2 from jimgraham/master

Match citation from title documentation to code
Adding BSD license, which fixes #1.
Set element to work on Firefox

Change the automatic update to work on Firefox. Setting `innerText`
would never update on FF. Used `innerHTML` instead.

Tested on Mac
 - Firefox
 - Google Chrome
 - Safari

Tested on Windows 7
 - Firefox
 - Google Chrome
Merge branch 'master' of https://github.com/jimgraham/universal-citekey-js