Fixed the issue in serial fast which placed some particles outside of all bins by forcing the program to round up the number of bins. Also changed autograder to be able to grade our program
Merge branch 'master' of https://github.com/jeffmahler/cs267
Added functions to domain decomposition to handle reorganization for particles and built an initial version of mpi fast
Lots of merges, also changes mpi fast to use the new interface

Merge branch 'master' of https://github.com/jeffmahler/cs267

Conflicts:
	hw2/domain_decomposition.cpp