Tags: Avvir/pyne

Add missing type hint

Add then_return_sequence

Add then_raise

Fix SyntaxWarning about using `is` in place of `==`

add CallArguments NamedTuple to last_call on stub

to_raise_error_with_message: Compare to actual exception message

Example code:

```
def f():
    raise e
expect(f).to_raise_error_with_message(msg)
```

Previous behavior: Asserts that `e.args[0] == msg`

New behavior: Asserts that `str(e) == msg`

In some cases this behavior is equivalent, but not all.

Resolves: #8

Add calls list to attached spy

Co-authored-by: Dan <dan@avvir.io>

Remove circleci caching behavior

Add mega_stub convenience function

Add MegaStub to replace unintuitive group_stubs

`group_stubs` was previously added to manage a collection of stubs as a group.
It gives the impression that it can be used to manage the stubs as a
group, but in practice it only:
1) Applies all stubs on creation
2) Will remove all stubs on exit of a with statement

Instead of fixing this behavior, and breaking tests that rely on it, it
is "deprecated", and a new `mega_stub` method creates an object that
manages the collection of stubs.
1) Doesn't change the state of the stubs on creation
2) Has `stub` and `unstub` methods that applies to the group
3) Has with-statement support that applies to the group

Stub / Unstab functions were added to Spy so that it can be used as part
of a `MegaStub`

`group_stubs` is marked as deprecated and yields a warning