making the envois script use commandline arguments, beginning to add support for latex rendering
adding latex templates from latextemplates.com and changing README.md to reflect new arg-driven nature of the envois script
changed arg parsing to handle file input names properly, added functionality to create file instead of outputing html/latex to stdout, updated README.md
removing an o I accidentally added to the beginning of the templates/invoice.html file
made pep-8 changes suggested by mek, added latex funtion to Invoice class and added subprocess call to generate .pdf from a rendered .tex template
merged invoice.cls and invoice.tex so that there would be no includes issues within tex, added more latex-generating functionality to envois/invoice.py
managed to make jinja and latex play nicely together (with some awful hacks), will clean up soon. added some more specific exception handling
adding TODO messages about urgent changes I'll be making soon
Merge pull request #10 from aupiff/master

basic latex functionality