Added ClassDigram and implementation of Strategy pattern.
Merge branch 'master' of https://github.com/viktor90/Team-Bulls-and-Cows-4

Conflicts:
	Bulls-and-Cows-4/BullsAndCows.v12.suo
	Bulls-and-Cows-4/bin/Debug/BullsAndCowsGame.exe
	Bulls-and-Cows-4/bin/Debug/BullsAndCowsGame.pdb
	Bulls-and-Cows-4/obj/x86/Debug/BullsAndCowsGame.exe
	Bulls-and-Cows-4/obj/x86/Debug/BullsAndCowsGame.pdb
	BullsAndCows.Tests/bin/Debug/BullsAndCows.Tests.dll
	BullsAndCows.Tests/bin/Debug/BullsAndCows.Tests.pdb
	BullsAndCows.Tests/obj/Debug/BullsAndCows.Tests.csprojResolveAssemblyReference.cache
	BullsAndCows.Tests/obj/Debug/BullsAndCows.Tests.dll
	BullsAndCows.Tests/obj/Debug/BullsAndCows.Tests.pdb
Added few minor modifications.