Modified returnValue in Activity.hpp to be private, and is settable by
subclasses through a protected method. The getReturnValue() function now
returns the activity's returnValue.
Updated activity interface to hide the exit code from subclasses.
Subclass implementors should use the endActivity function to end their
activity.
Made stackActivity and running fields in Activity to be private.
Exposed a setStackActivity method for subclasses to use to set the stack
activity.
Fixed bug in Job.hpp for runner.
Used fixed Job.hpp. Removed templates from Activity class. Implemented
LoadingActivity.