Added plot_tally_data.py
updated plot_mesh_tally.py
Added use of double colon to style guide.
Updated user's guide tallies.xml specification.
Fixed two errors in documentation.
Moved cross_sections.xml to data directory and added a readme file.
Added readme to tests directory.
Moved read/write_source_binary to state_point module.
fixed incorrect array size when reading entropy from HDF5 file
Merge pull request #151 from InspiredOne/master

Added plot_tally_data.py to utils
Fixed filename qstring issue. Fixed shebang position. Commented out print statements