Support clicking past last editor line

Clicking below the last line of an editor
now either moves the cursor to the end of
the file or selects to the end of the file
if shift is pressed.

src/app/editor.coffee

@@ -326,6 +326,14 @@ class Editor extends View
       @removeClass 'focused'
       @autosave() if config.get "editor.autosave"
 
+    @scrollView.on 'click', (e) =>
+      return unless e.target is @scrollView[0]
+      return unless e.offsetY > @overlayer.height()
+      if e.shiftKey
+        @selectToBottom()
+      else
+        @moveCursorToBottom()
+
     @overlayer.on 'mousedown', (e) =>
       @overlayer.hide()
       clickedElement = document.elementFromPoint(e.pageX, e.pageY)