extract plugin

This plugin defines a function called extract that extracts the archive file
you pass it, and it supports a wide variety of archive filetypes.

This way you don't have to know what specific command extracts a file, you just
do extract <filename> and the function takes care of the rest.

To use it, add extract to the plugins array in your zshrc file:

plugins=(... extract)

Supported file extensions

Extension	Description
`7z`	7zip file
`Z`	Z archive (LZW)
`apk`	Android app file
`bz2`	Bzip2 file
`deb`	Debian package
`gz`	Gzip file
`ipsw`	iOS firmware file
`jar`	Java Archive
`lzma`	LZMA archive
`rar`	WinRAR archive
`sublime-package`	Sublime Text package
`tar`	Tarball
`tar.bz2`	Tarball with bzip2 compression
`tar.gz`	Tarball with gzip compression
`tar.xz`	Tarball with lzma2 compression
`tar.zma`	Tarball with lzma compression
`tbz`	Tarball with bzip compression
`tbz2`	Tarball with bzip2 compression
`tgz`	Tarball with gzip compression
`tlz`	Tarball with lzma compression
`txz`	Tarball with lzma2 compression
`war`	Web Application archive (Java-based)
`xpi`	Mozilla XPI module file
`xz`	LZMA2 archive
`zip`	Zip archive

See list of archive formats for
more information regarding archive formats.