Added .gitignore file

Python .gitignore file taken from GitHub's gitignore repository
https://github.com/github/gitignore
Added include and header files from the WRF model

Files can be found in the WRF climiate model cartographic_data.tar.gz
file available at http://wrf-model.org/gui/map/.  Licensing of these files
should be determined.
Minor changes to comp_by.f
Minor changes to fortconbuf.f
Minor changes to pvadv.f
Minor changes to tsoar.f
Minor changes to adiabatic_te.c
Minor changes to temp_mixratio.c
Minor changes to temp_of_to.c
Minor changes to meteoLib.h
f2py signature files
Updated README.rst
Example calctd function
DOC : initial sample documentation