Name full-screen-image setup function and call it

This change sets up "Full Screen Image" JS everytime courseware tabs are clicked, as they are js/templates and not available in the DOM on page load.
Specify MIME type when adding SCRIPT tag

This change is needed to prevent Studio from stripping this SCRIPT tag
from the input.
Merge pull request #85 from Stanford-Online/stv/image-modal-bugfix

Specify MIME type when adding SCRIPT tag
Merge pull request #83 from Stanford-Online/giulio/local-image-modal-bugfix

Name full-screen-image setup function and call it