Bind `M-s M-s' globally to `eww-search-words'

Fixes: debbugs:16258

* etc/NEWS: Mention the new `M-s M-s' keystroke.

* lisp/bindings.el (search-map): Bind M-s M-s to `eww-search-words'.

* net/eww.el (eww-search-words): New command.

etc/ChangeLog

+2014-11-14  Lars Magne Ingebrigtsen  <larsi@gnus.org>
+
+	* NEWS: Mention the new `M-s M-s' keystroke.
+
 2014-11-13  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Fix minor Bazaar leftovers.

etc/NEWS

@@ -51,6 +51,9 @@ Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
 
 ** C-h l now also lists the commands that were run.
 
+** The new M-s M-s key binding uses eww to search the web for the
+text in the region.
+
 ** M-x suggests shorthands and ignores obsolete commands for completion.
 ** x-select-enable-clipboard is renamed select-enable-clipboard.
 x-select-enable-primary and renamed select-enable-primary.

lisp/ChangeLog

+2014-11-14  Lars Magne Ingebrigtsen  <larsi@gnus.org>
+
+	* bindings.el (search-map): Bind M-s M-s to `eww-search-words'.
+
+2014-11-14  Kenjiro NAKAYAMA  <nakayamakenjiro@gmail.com>
+
+	* net/eww.el (eww-search-words): New command (bug#16258).
+
 2014-11-13  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
 	* net/shr.el (shr-inhibit-images): Add a doc string.

lisp/bindings.el

@@ -926,6 +926,7 @@ if `inhibit-field-text-motion' is non-nil."
 (define-key esc-map "s" search-map)
 
 (define-key search-map "o"  'occur)
+(define-key search-map (kbd "M-s")  'eww-search-words)
 (define-key search-map "hr" 'highlight-regexp)
 (define-key search-map "hp" 'highlight-phrase)
 (define-key search-map "hl" 'highlight-lines-matching-regexp)

lisp/net/eww.el

@@ -198,6 +198,12 @@ word(s) will be searched for via `eww-search-prefix'."
 		    "/")
 	       (expand-file-name file))))
 
+;;;###autoload
+(defun eww-search-words (&optional beg end)
+  "Search the web for the text between the point and marker."
+  (interactive "r")
+  (eww (buffer-substring beg end)))
+
 (defun eww-render (status url &optional point buffer)
   (let ((redirect (plist-get status :redirect)))
     (when redirect