Give option of returning reaction only (or with kinetics) in chemkin format.
Added helper functions for easily changing kinetic A factors.
Include Chlorine in list of elements when writing to chemkin file.
Keep track of global chemkin reaction count even when verbose is turned off.

saveChemkinFile was reporting 0 chemkin reactions when verbose was turned off,
which would be alarming if actually true.
Documentation: added features and credits pages to RMG section.
Documentation: input file creation for RMG-Py.
Added framework for RMG user's guide.
Documentation: Add RMG theory guide.
Documentation: Port over thermochemistry estimation section.
Documentation: Fix email links in main page.
Documentation: Species and group representations.
Documentation: Added notes about molecular oxygen representation.
Documentation: Started example input files page.
Documentation: Fix name for generate reactions.
Updating the documentation for the input file
Documentation: Port over model building guidelines.
Documentation: Using and adding training reactions to database.
Added documentation about kinetic database

All the information may not be as correct or as up to date as we'd like,
but at least it gives a base-line for new users to get used to the new
database. I'm not confident the specifics of the averaging
algorithm are correct. I'll also want to revisit the pitfalls sections for
further suggestions and checking if there is atom-by-atom children
checking.

Unfortunately, I'm leaving for a few months, so I wanted to just
upload whatever I had.
Merge branch 'master' of github.com:GreenGroup/RMG-Py
Fix comment abt saving kinetics depository entry.