Refactored to re-use single studentData object

Previous code was creating a new instance of studentData object, each
of which invoked the same SQL query, for every field value.
Fixed wp_enqueue_script() not being called correctly to load css

WordPress was complaining that it needs to be called in the
wp_enqueue_scripts action.
Changed order that hooks were being called in

This was necessary because the username of the currently-logged-in
user was not available yet at the point when the studentData class
was being instantiated. Also added a lot more debugging output.
Merge pull request #19 from shawn-bellevuecollege/singleStudentDataObj

singleStudentDataObj