Settings, Login, and Misc Fixes

- Removed MtGox from coinwatcher modal
- Updated JS to redirect to login page if user's session has timed out
or has logged in elsewhere
- Updated Settings to clear cookies
- Updated settings to only be accessible if logged in
- Added ajax-loader image on SwitchPool modal. Sometimes retrieving
content is slow from a remote location
- Handled for noticed that complain about missing $jsArray variable