Fixing closing overlays on ESC.

Every page of in the overlay registers its own cancelOverlay event
handler which allows them to return to other overlays when ESC
button is pressed rather that the default main page.
Implement search functionality in the behavior history overlay.
Merge pull request #90 from p-march/overlays

Fixing closing overlays on ESC.
Perform case-sensitive matching of API names in realtime behavior log.
Merge remote-tracking branch 'origin/master' into search
Merge pull request #91 from mvrable/search

Implement search functionality in the behavior history overlay.
Bug fix.

When search box goes out of focus, it gets empty, but the main
page does not get updated and still shows filtered extensions.
This bug is fixed.
Merge pull request #92 from p-march/fix

Bug fix.