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If a lock is acquired using a `with` block, and an exception occurs within that block, it should still be released. This commit uses a `try:` `finally:` structure to do this.
StrictLock and CompositeLock can be used as context managers in 2 ways. They are context manager classes (__enter__ and __exit__ methods) but the __call__ method is a generator context manager too - allowing arguments. This code now tests both forms.
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There's a difference in behaviour between:
and
The code that implements the latter (to allow arguments) does not release the lock if an error occurs. This is now fixed, and a test is added to check both code paths.
Closes #274