Relaxes generic constraints in Presenters

[diegosanchezr]

Presenters shouldn't have any restriction about what models they receive. Their responsability is to present a CollectionViewCell and they only need a ViewModel for that. Therefore, it's responsability of the ViewModelBuilder to be able to provide a ViewModel for a especific model and it's there where the type constraint should reside.

For instance, this allows reusing a PhotoMessagePresenter without having a model conforming to PhotoMessageModelProtocol.

[codecov-io]

Current coverage is 61.29%

Merging #35 into dev will increase coverage by +0.05% as of 0aa9972

@@              dev     #35   diff @@
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  Files          55      55       
  Stmts        2851    2855     +4
  Branches        0       0       
  Methods         0       0       
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+ Hit          1746    1750     +4
  Partial         0       0       
  Missed       1105    1105       

Review entire Coverage Diff as of 0aa9972

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