6.8.0

Features

Issue 98 Added Stubbing method to_call_super so that you can force a doubled object to call its super method instead of being stubbed out.
Added Stubbing method to_do_nothing. This allows you to be a little more deliberate in your stubbing and is more readable than to_return(null) which is basically all it does. It also suppresses un-stubbed method messages.
Issue 115 Partial doubles can now be created with the partial_double method. This will give you an object that has all of its methods stubbed to_call_super. So it will act the same as a normal object, but you can spy and stub methods on it as well.
Experimental FULL doubling is now working in Godot 3.1.
Experimental FULL doubling now stubs all supported built-ins to_call_super under the covers. This means you can stub methods you haven't overloaded in your class (before you could only spy on them).
Issue 105 Added -gexit_on_success option to the command line to only exit if all tests passed.
Added get_version method to Gut.gd.

Housekeeping, typos and some unused variables.
Issue 108 Maximize doesn't move back to 0,0.
Xrayez fixed Issue 109.
Issue 117 The Spying related methods now fail if you don't pass an array for the list of expected parameters. Something I forgot about when making "TDD and P O N G" episode 2. You can watch it and enjoy me forgetting how to use my own tool.
Exporting tests in 3.1 appears to be working now. Could not reproduce original issue.
Issue 111 Tests are now sorted.