Added NUNIT and references to NUNIT test classes.
Merge branch 'master' of https://github.com/CSC309-SoftwareEngineering/Marccello-mkII

Conflicts:
	Marccello/bin/Marccello.dll
	Marccello/bin/Marccello.pdb
Added framework for NUNIT
Merge branch 'master' of https://github.com/CSC309-SoftwareEngineering/Marccello-mkII