Update Bootstrap jQuery to V3.1.1

I've changed the filename (using underscores for readability and I think multiple periods throws windows sometimes) in line with http://docs.moodle.org/dev/jQuery#Including_your_own_plugins.  This is because the jQuery inclusion mechanism in Moodle does not react to a 'Purge all caches', you either have to change the filename or clear the browser cache at the client end such that it requests a copy from the server.  Or indeed wait for the file to expire in the clients browser cache!  So, the former is the easiest way to update the code.

There are two commits so that you can see in this instance what has changed between 3.0.3 and 3.1.1.