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Fixes #2641, #2642

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

The wiki is more readable than going to the plugins directory.

Especially given the inc_append_history option, it is not necessary to
set the (default) append_history option.

Adds command line aliases useful for dealing with JSON

Updates and refactors spectrum.zsh