Create cider-doc-map and add "\C" versions of the keys when it makes sense.

Very nice initiative to create a doc map. Thanks. 

This patch adds a couple of control prefixed keys. For my brain <kbd>C-c C-d C-d</kbd> is much more convenient than <kbd>C-c C-d d</kbd>.

It was not an accident. There is no CIDER menu in docview. I have added
there for the convenience and illustration purposes.

>>> Bozhidar Batsov on Mon, 04 Aug 2014 14:41:45 -0700 wrote:

 BB> You've move here inspect by accident. In belongs in cider-menu.