WIP - using launchd to update the TCC database to insert ShiftIt permissions using mktrusted helper.
Updated the check for accessibility service authorization.

The application will try to guide to grant the access to the accessibility services for ShiftIt.
Add info alert when show menu item is disabled.
Updated the way how accessibility access is checked.

Finally this is the only way how to fo this I think. Even better would be to use the `AXIsProcessTrustedWithOptions((CFDictionaryRef) options);` however this is async and with a model dialog in agent application (the dialog is above all others) it is displayed right under the dialog.
Merge branch 'feature/maverick-support' into develop
Added travis build badge