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Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

This is exactly what happens on tab completion for docker rmi. This commit
fixes that.

```sh
$ docker rmi <hit TAB>
_arguments:comparguments:312: invalid argument: __docker_images
_arguments:comparguments:312: invalid argument: __docker_images
_arguments:comparguments:312: invalid argument: __docker_images
```

In Python3 without universal_newlines set to True
output from Popen was byte-encoded.

Spelling correction in itunes control function.

The mailcatcher gem does not work correctly when executed through Bundler.

adding urldecode_json to compliment urlencode_json and updating readme.md; slight tweak to urlencode_json from previous commit

Many deprecations since 0.8 and new commands.

This commit allows for paths with spaces to be symlinked
in Pow.

If an application is located in a folder like `/some path/to the/app`
the powit command would fail when it shouldn't. It's not the case
anymore.

Rendering the 'vagrant box (remove|repackage)' completion code independant of Vagrant implementation details.

Added an <esc> to the begining of everything. I ran something when I was in insert mode once and all it did was shove !args... into the buffer.  <esc> first.

Added an optional callout to the end of the interaction function. I put it in to allow me to put the window focus on MacVim / GVim depending on the different OS I happen to be on

Fixed: If you callvim on a non-existant file with a relative path, the CWD of the running gvim process is used, and that's not right.  We use the PWD explicitly instead, in this case