Added argparse support.
Init
Untrack test_files
Updated cleaning rules.
According to experiment of postalias / aliases.db , modified cleaned
function and recorded rules.
Added `clean_key` function
Rewritten functions
Fixed bug that function name inconsistency in doctest
Fixed regexp bug and merged doctest to __doc__
Updated __doc__
Merge pull request #3 from apua/apua

Apua