#37 - Added requirements clarification models provided by Dean on
24-Jul-2014, named XTR_model_V3.zip, containing a project called
"training Project Ver 2".
#37 - Updated use case specifications to make them more consistent with
one another.
#37 - Added overview use case diagram.  Fixed minor naming error on
UC08.  Small cosmetic change to Tracking component package diagram.
#37 - Cosmetic changes for UC01 sequence diagram.
#37 - Deleted unneeded sequence and use case diagrams.
#37 - Minor corrections and cleanup for the activity diagrams.
#37 - Fixed minor issues (mainly spelling) in requirements models.