Class-registry

* Fixed an issue preventing `EntryPointClassRegistry.get()` from applying branding.

Binary Distribution Checksums
* class-registry-2.1.2.tar.gz
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* Calling `__contains__` no longer raises an exception if the corresponding class' initalizer requires arguments.
* `EntryPointClassRegistry` now applies branding aggressively:
* Branding is applied immediately upon initializing the registry.
* Branding is applied to both classes and instances (important for entry points that reference functions/methods).

Binary Distribution Checksums
* class-registry-2.1.1.tar.gz
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**⚠️ This version contains changes that are not backwards-compatible with Class Registry v2.0.2. Please review the Backwards-Incompatible Changes before upgrading! ⚠️**

Backwards-Incompatible Changes
* Renamed methods in `ClassRegistryInstanceCache` to make it easier to understand what they are used for:
* `gen_cache_key` => `get_instance_key` (this method is used to determine the lookup key for cached instances)
* `gen_lookup_key` => `get_class_key` (this method is used to determine the lookup key for registered classes)

Other Changes
* Fixed incorrect PEP-484 type hints.
* Travis CI now builds universal wheels.
* Travis CI now only deploys tagged releases to PyPI.

Binary Distribution Checksums
* class-registry-2.1.0.tar.gz
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**Backwards-incompatible change: class-registry now requires pip 9 or later.**

* `EntryPointClassRegistry` initializer now accepts an optional `attr_name` argument. When set, the registry will "brand" each class/object that it returns with the corresponding registry key.
* Note: If the class/object already has an attribute with the same name, it will be overwritten.
* Upgraded Travis CI configuration to use trusty images.
* Removed some dead code.

Binary Distribution Checksums
* class-registry-2.0.2.tar.gz:
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First official release of ClassRegistry.

Ships with the following components (in no particular order):

* `ClassRegistry`: manually register/unregister classes.
* `SortedClassRegistry`: customize sort order for `ClassRegistry`.
* `EntryPointClassRegistry`: automatically register classes using setuptools entry points.
* `AutoRegister`: automatically register non-abstract subclasses of a base class.
* `ClassRegistryInstanceCache`: cache instances to create a service registry.

Plus some base classes and mixins.

Binary Distribution Checksums
* class-registry-2.0.1.tar.gz
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