Force installation of pyparsing-1.5.7
Fix typo in documantation for MAC installation
Fix typo in documantation for MAC installation
Bug fix: missing numpy import
Allow CanTherm to save multiple job outputs to chem.inp.

The resulting chem.inp will not be a complete Chemkin file, but will contain
snippets that can be easily moved into Chemkin files.
Change all Cython attributes marked readonly to public.

This allows us to compile RMG-Py again with the latest version of Cython
(0.19). Cython 0.17.x and 0.18.x still do not work because of another issue.
Despite the change, you should probably still treat these attributes as read-
only.
Updated the requirements.txt file for PIP

Only real change is requiring cython>=0.19
(0.16 works, but 0.17 and 0.18 don't)
Oh, and I added argparse and gprof2dot, for the profiling post-processing.
Besides that it's mostly rearranging and adding comments.
test