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Repost of #5319 and refactor of rake-fast plugin

This solves a problem of using the variable name `$path' which then
smashes the environment variable `$PATH' and messes up the session.

See https://github.com/robbyrussell/oh-my-zsh/pull/5343#issuecomment-243043098

* Added perms plugin

* HTTPS -> HTTP for comment URL

* Added a README

* Updated TOF comment

* Pulled in updates by apjanke with minor tweaks

Fixes the "syntax error: expected line end ..." (-2741) when using the tab, split_tab and vsplit_tab commands in iTerm2 v3

* updated OSX plugin docs

Clean up Archlinux plugin

Also make all functions local as to not spill variables into the
global namespace.

Problem introduced in 136a8343.

Signed-off-by: Marc Cornellà <marc.cornella@live.com>

This fixes the use case where a directory in the dir stack
doesn't exist anymore, so the keystroke doesn't appear to
do anything.

It will keep trying to switch to the n-est directory in the
stack until it founds an available directory or the dirstack
has no more directories to switch to.

Signed-off-by: Marc Cornellà <marc.cornella@live.com>

*  Also gfa conflicts with git shortcut

The parsing output for full git log output too slow so it replaced
with last commit show request, wich cause error if repository is empty