When clicking a link inside the element, stop propagation of the click

event so that the link works like normal.
Also tighten up the code is no longer necessary in the mouseup event

because the click handles the same thing.

Tested on my mac in Chrome, Firefox, and Safari (sorry I don't have any IE handy to test with):

Clicking a link opens in a new tab. -- It no longer opens the editor either if you have permission to edit.
Clicking and dragging, mouseup on the link selects the text, doesn't open the editor
Clicking anywhere else still opens the editor.