faac: add bottle.
ffmpeg: add bottle.
lame: add bottle.
libav: add bottle.
texi2html: add bottle.
x264: add bottle.
xvid: add bottle.
yasm: add bottle.
CODEOFCONDUCT: add Homebrew CoC, diversity doc.

Add the Homebrew Code of Conduct and Diversity statement. These are heavily based on those created by Python:
http://www.python.org/psf/codeofconduct/
http://www.python.org/community/diversity/