.ffignore @ fa73ab8df568

Fix sjl/learnvimscriptthehardway#63

`:help silent!` throws an error E149: Sorry, no help for silent!, however, `:help :silent` opens up the expected help file.

syntax: literal
\.DS_Store
\.ropeproject
tags
build
venv

syntax: regex
.*\.pyc
.*\.swp
.*\.swo
.*\.un~