Unpack everything with one command

Current version

unp requires the following formula to be installed:
p7zip 16.02_1 7-Zip (high compression file archiver) implementation

Recent formula history

Miguel Araújo unp: remove extra spaces (#3936)
ilovezfs unp 2.0-pre7-nmu1
Dominyk Tiller unp: prefer berkeley debian mirror
Xu Cheng unp: bottle unneeded
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages

Formula code at GitHub