Remove escape_string from menus themselves; snippets are always lists
Remove escape_string from menus themselves; snippets are always lists

There are a few reasons / effects of this change:

1) Should speed up loading a little, so that the function isn't called on all
   these things that never get used.
2) Allows me to add the code as a tooltip, so you see what you're getting.
3) Makes menu creation a little easier.

ipython-contrib/IPython-notebook-extensions,ipython-contrib/IPython-notebook-extensions,ipython-contrib/IPython-notebook-extensions,juhasch/IPython-notebook-extensions,juhasch/IPython-notebook-extensions,jcb91/IPython-notebook-extensions,juhasch/IPython-notebook-extensions,moble/jupyter_boilerplate,ipython-contrib/IPython-notebook-extensions,jcb91/IPython-notebook-extensions,jcb91/IPython-notebook-extensions