Added additional checks to Solver for when the recursive call returns null.
Merge pull request #11 from Winston-Chan/nathan

Added additional checks to Solver for when the recursive call returns nu...
Merge branch 'master' of https://github.com/Winston-Chan/CPSC449
Merge remote-tracking branch 'origin/Daniel'
Aesthetic modifications to setupRoot.
Merge pull request #12 from Winston-Chan/nathan

Aesthetic modifications to setupRoot.