Migrate t-SNE to Sci-Kit-Learn Implementation

[Adamtaranto]

Migrate t-SNE clustering option to the SKL implementation for consistency with PCA method.

http://alexanderfabisch.github.io/t-sne-in-scikit-learn.html http://scikit-learn.org/stable/modules/generated/sklearn.manifold.TSNE.html https://www.oreilly.com/learning/an-illustrated-introduction-to-the-t-sne-algorithm

[Adamtaranto]

Done! Also kept custom implementation as seems to yield better structure.

Use as PY-TSNE or SKL-TSNE