Generate PDF using XeLaTeX
travis: Install xetex and gyre
conf.py: LaTeX font size is 10pt
README: Document TeX setup
README: Remove contractions
README: Add setup section
README: Command-L isn't needed to change location
README: Remove double spaces
Merge pull request #437 from rleigh-dundee/xelatex-pdf-develop

Generate PDF using XeLaTeX