--mode agr: map aliases to main name when parsing instead of when using
split preparing sources to two statements
use os.sep instead of hardcoded '/' char

Include info in doc about preparing excluded_paths
tests for ff.is_path_excluded
added help messages for args: -i, -d, -s, -m

also refreshed usage section in README
Merge branch 'master' of github.com:mysz/ff