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Allow ctrl-p, ctrl-n for history navigation while in insert mode.

taken from [here](http://www.zsh.org/mla/users/2008/msg01013.html)
We want pressing v in command mode to take us to an editor (defined by the $VISUAL or $EDITOR variable or vi) to edit the current contents of the command line which (I believe) is a standard feature of bash vi-mode or other readline prompts (see [here](http://www.catonmat.net/download/bash-vi-editing-mode-cheat-sheet.pdf) and [here](http://www.catonmat.net/blog/bash-vi-editing-mode-cheat-sheet/) for source).

This reverts commit b609aa0e -- this commit
was a bad idea, because it makes vi-mode very difficult to use. The default
`bindkey` keybindings are NOT MEANT to coexist with `bindkey -v` Vi mode;
that's why `bindkey -v` clears them in the first place! Restoring all of the
default keybindings after enabling Vi mode, the way the reverted commit did,
causes many collisions between those default keybindings that begin with ESC
and the command-mode-initiating ESC of Vi mode. See Issue 1438 of
robbyrussell/oh-my-zsh. If people have custom keybindings, they should create
them in their ~/.zshrc AFTER enabling the vi-mode plugin and sourcing
oh-my-zsh.sh.

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   plugins/vi-mode/vi-mode.plugin.zsh
#

fixes #387 and https://github.com/robbyrussell/oh-my-zsh/pull/1321#issuecomment-9959540
and other problems of prompt overwriting when people did not realize that it
was vi mode causing the problem.  Hat tip to sorin ionescu, as I took this code
from prezto

the vi-mode plugin destroys any bindings made before it is sourced due to the
'bindkey -v' call to switch to using vi-mode.  This patch saves the bindings
before invoking 'bindkey -v' then rebinds them afterwards, this fixes a number
of outstanding issues due to people using vi-mode and having things in oh-my-zsh
break due to the bindings being destroyed

Reorganizing plugins so that each plugin has it's own directory now so that any plugin-specific functions can be bundled within there.