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This updates the git-flow-avh plugin to the latest version
from https://github.com/petervanderdoes/git-flow-completion
(0.6.0 at the time of this commit).

This mainly adds support for the "git flow bugfix" command.

This PR replaces #4626 as well as #4705, both of which adds support for the bugfix command but doesn't use the official version from https://github.com/petervanderdoes/git-flow-completion

Fixes #4705
Fixes #4626
Fixes #5903

It seems that `bundle version` calls git to know the commit sha, while `bundle --version` only shows the version of bundler.

Fixes #6988

Fixes #5722
Fixes #5864
Fixes #5920
Fixes #6566
Fixes #6579
Fixes #6686
Fixes #6740

Version: ff73f40 (2018-05-02)

Fixes #5859
Fixes #5878
Fixes #5983
Fixes #6013

* Fix dotenv plugin accepted file format

* clarify README and add disclaimer section

* Add Yarn upgrade-ineractive CLI command

* Remove dots at the end of completions

This can avoid big mistakes as this I just made.
I thought I could give it an argument. So, now, it is possible.

* enable passing multiple directories to take

* Update take function

Do not call cd if mkdir fails

Fixes #5874

Related:
https://github.com/lukechilds/zsh-nvm/issues/23
https://github.com/zsh-users/antigen/issues/586

* add plugin:percol

* fix format

* check percol

* fix empty history in gnome terminal

(Probably due to an original copy-pasta'ing, `vagrant`'s completion thought it was `gem`'s completion.)

* Added magic-enter plugin

To bind commonly used tasks to the enter key

* Allow the magic-enter commands to be modified by the user

I found this quite annoying not being in this theme after switching from gentoo-theme, it's helpful and it doesn't detract from simplicity.

Otherwise these files are not sourced:
  1. /etc/zprofile
  2. ~/.zprofile
  3. /etc/zlogin
  4. ~/.zlogin
  5. ~/.zlogout
  6. /etc/zlogout

When invoking a shell as root using ```sudo -s```, the ssh-agent plugin
starts a new agent although it already exists.

The problem boils down to a check if ssh-agent is running using
```ps x```. If that is extended to ```ps ax``` for root, then the
existing ssh-agent will still work.

- Add double quotes to command so that the next argument isn't
  interpreted as the title for the start command.

- If the first argument is a valid path, convert it to Windows path
  notation. If `wslpath` fails—because it's a path from inside WSL,
  which cannot be converted to Windows path notation— fail with an
  error code.

  This last circumstance will show an error like so:

    wslpath: path: Result not representable