Move $.fn.hasFocus to space-pen

package.json

@@ -46,7 +46,7 @@
     "scandal": "0.11.0",
     "season": "0.14.0",
     "semver": "1.1.4",
-    "space-pen": "3.0.3",
+    "space-pen": "3.1.0",
     "temp": "0.5.0",
     "text-buffer": "0.12.0",
     "underscore-plus": "0.6.1",

src/space-pen-extensions.coffee

@@ -59,9 +59,6 @@ jQuery.fn.destroyTooltip = ->
   @hideTooltip()
   @tooltip('destroy')
 
-jQuery.fn.hasFocus = ->
-  @is(':focus') or @is(':has(:focus)')
-
 jQuery.fn.setTooltip.getKeystroke = getKeystroke
 jQuery.fn.setTooltip.humanizeKeystrokes = humanizeKeystrokes