Dhii/di-abstract

## Dhii - DI Abstract ##
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Abstract, standards-compliant, re-usable, tested implementation agnostic of concrete cases.
Use functionality in this package to create DI container implementations.

The packages adheres to the [SemVer][] specification, and there will be full backward compatibility between minor versions.
Additionally, it follows the rule of the [caret operator][], i.e. there will be full backward compatibility between patch pre-release versions.

[SemVer]:                                   http://semver.org/
[caret operator]:                           https://getcomposer.org/doc/articles/versions.md#caret