Torchkge

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* Fixed error in bilinear models.

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* Added intermediate function for hitk metric in link prediction.

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* Fixed assertion error in Analogy model

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* Implemented Triplet Classification evaluation method
* Added Negative Sampler objects to standardize negative sampling methods.

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* Implemented HolE model (Nickel et al.)
* Implemented ComplEx model (Trouillon et al.)
* Implemented ANALOGY model (Liu et al.)
* Added knowledge graph splitting into train, validation and test instead of just train and test.

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* Implemented Bernoulli negative sampling as in Wang et al. paper on TransH (2014).