add h5py and revise comments regarding MPI
added h5py, removed pytables, minor cleanups
switched h5py default from pip to apt-get
Merge pull request #2 from drammock/add-h5py

add h5py and revise comments regarding MPI
wip: implement flags for preferred install methods
implemented up through spyder
WIP: adding configuration options
refactored HDF5 installation block
fix rebase snafu