Clusteval

* Updating and refactoring to make the library compatible again with new versions of dependencies.

* Fix for `scatter`. Update in input parameters

* Fixes for tSNE perplexity and title
* add normalization parameter
* Various other improvements
* Docstrings update

* many fixes and updates
* wget is replaces by internal functions
* plots are updated
* added new plot: `ce.plot_silhouette()`
* bugfix for min_samples fixed
* jitter functionality added
* logging improved
* update docstrings

* fix in case silscore is empty

* `sklearn` changed into `scikit-learn` in both requirements and setup file.