changed fsr map to unordered map and implemented neighbor cell segmentation
updated version number in setup.py
fixed error in CMFD computeDs and changed convergence to FSR fission sources
Modified GPUSolver to use FSR fission sources as residual
modified GPUSolver to compute fission source residual and work around unordered map
updated version number to 0.1.4
fixed typo in VectorizedSolver
make minor corrections for pull request
Merge pull request #111 from samuelshaner/develop

Fixed error in CMFD computeDs and increased segmentation performance