Removed ProjectMap

This seems to cause a bunch of errors
Rename OpenVsResolved to indicate it is a graph

Add an Issue by Priority graph.
Create base class for graphs

Refactor the two graph classes to use a common base class to allow for a
common look and feel and eliminate duplication.
Add a title to each chart
added code for UC3.11
Added Scrum Unit Test Cases
Clean up of some of the graphing and use cases for the IssuePriorityGraph
Updates to OpenVsResolvedGraph unit tests
Merge branch 'master' of https://github.com/benhejl/SWENG500_Team1
Finished Scrum Use Cases
Fixed Database to remove foreign key.
Removed some code.