Allow suffixes for cheat files (e.g. DataFrames.jl).
Reformat to meet PEP8 style.
Colorize output using Pygment lexers.
Make Pygments a soft dependency.
Add a check for posix environment for pygments.
Explicitly mark comment lines in builtin sheets.
Resolved a trivial merge conflcit in cheatsheets/sed. Resolved major merge conflict in ./cheat. Made very minor revision to @larsyencken's patch to prevent __init__.py/c files from being listed as cheatsheets.
Made it also necessary to set an environment variable in order to display colors to the terminal (in an effort to avoid an otherwise inevitable holy-war).
Updated the README to include instructions for enabling syntax highlighting.