Minor change on Knight and Rook isObstructed function
Merge branch 'master' of https://github.com/nitin2050/DirectedResearch.git
Minor changes on isObstructed function for Knight and Rook class
1. modified return value of isObstructed method()
2. get boardInsance instead of newBoard
Merge branch 'master' of https://github.com/nitin2050/DirectedResearch.git
selectRandomSquare method is added to the queen and bishop class