Suggestion for type inference for the Model

[pnerg]

Suggestion for type inference for the Model

This PR is a suggestion to fix automated type inference allowing the user to write code without casting Model instances.
The type of the Model to be returned is inferred by the left side of the expression.

Example provided below

DogModel mockModel = new DogModel("pluto", 5);
DogModel savedModel = mockImpl.fetch(mockModel);

[codecov-io]

Current coverage is 60.82%

Merging #8 into master will not affect coverage as of 16b7ceb

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Review entire Coverage Diff as of 16b7ceb

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