Injector

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- Fixed a false positive bug in dependency cycle detection (AssistedBuilder can be
used to break dependency cycles now)

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- :meth:`injector.Provider.get()` now requires an :class:`injector.Injector` instance as
its parameter
- deprecated injecting arguments into modules (be it functions/callables,
:class:`~injector.Module` constructors or :meth:`injector.Module.configure` methods)
- removed `extends` decorator
- few classes got useful __repr__ implementations
- fixed injecting ProviderOf and AssistedBuilders when :class:`injector.Injector`
auto_bind is set to False (previously would result in `UnsatisfiedRequirement`
error)
- fixed crash occurring when Python 3-function annotation use is enabled and
__init__ method has a return value annotation ("injector.UnknownProvider:
couldn't determine provider for None to None"), should also apply to free
functions as well

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- Bug fix release.

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- Child :class:`~injector.Injector` can rebind dependancies bound in parent Injector (that changes :class:`~injector.Provider` semantics), thanks to Ilya Orlov
- :class:`~injector.CallableProvider` callables can be injected into, thanks to Ilya Strukov
- One can request :class:`~injector.ProviderOf` (Interface) and get a :class:`~injector.BoundProvider` which can be used to get an implementation of Interface when needed

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- Binding annotations are removed. Use :func:`~injector.Key` to create unique types instead.

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- Fixed regression with injecting unbound key resulting in None instead of raising an exception