Stop dragging when clicking inside the metadata...

... Clicking on the header bar should still let the overlay be dragged
around.
Add a wrapper div, to more easily avoid dragging in some cases.
Revert "Add a wrapper div, to more easily avoid dragging in some cases."

This reverts commit a9c27132e5c492cdca91c3a1dd968f746b8a764a.
Going to use a more precise selector instead.
Use more logical selector to allow dragging with the header area.

Should now be able to copy/paste any text contained in the overlays.
Merge pull request #24 from adam-vessey/7.x

Stop dragging when clicking inside the metadata...