Update for 3.8

Fixes problems related to DBus. WIP: Hotkey not working.
Add new option to replace "Activities" button

Leaves hot corner intact, removes text of the button and places the
extension menu right of the hot corner/button.
Add a few missing semicolons
Migrate "show-hamster-dropdown" keybinding to gnome-shell 3.8
Merge pull request #1 from WBTMagnum/newstuff

Migrate "show-hamster-dropdown" keybinding to gnome-shell 3.8
Set the focus on the activity input for hotkey toggles
Merge pull request #60 from aleho/newstuff

update to work with 3.8; fixes by @aleho and @WBTMagnum