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>.

Fuck. There were lost somewhere in the patch-on-patch ... process ...

 >>> Bozhidar Batsov on Mon, 04 Aug 2014 14:42:37 -0700 wrote:

 > In cider-doc.el:
 >> (let ((map (make-sparse-keymap)))
 >> (define-key map "q" 'cider-popup-buffer-quit-function)
 >> -    (define-key map "j" 'cider-doc-javadoc)
 >> -    (define-key map (kbd "<backtab>") 'backward-button)

 > Why did you remove those?

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