Removed the Wordpress credits from the footer

The credits was taking up too much screen real estate.
Specialized the post template

This page is designed for displaying submissions and assignments.
There's no need to overwrite the entire single.php template to do so.
Updated code style to mirror other pages
Removed undefined variable warnings
Fixed display issue
fixed typos
createSubmission now accepts an object parameter

An object is more extensible than a parameter list, allowing additional
parameters to be added without changing the interface. Passing in an
object as a parameter more closely resembles Wordpress' style of
argument passing.
User can select the entry point for their Jar file

The starting class (one derived from Applet or JApplet) is needed to
display the applet on a website. I have not found a way to automatically
detect the correct starting class (see
    http://stackoverflow.com/questions/20557504/how-can-i-determine-the-entry-point-of-java-applet-from-its-jar-file
    http://stackoverflow.com/questions/20579579/why-is-this-main-class-not-a-subclass-of-applet)
so this work around lets the user select between common starting classes
or enter their own.

fixes https://github.com/kelvinhsung/GTCS12/issues/14