Performance issues + progress bar for cluster algos

[jaschil2]

Add progress bar for cluster algorithms. Try to improve performance of GMM by sampling less when creating training set for fitting. Maybe allow users to select sample resolution.

[jaschil2]

This may not be possible. I have removed the gaussian mixture model as it is slower than minibatch k-means

[dadamsncsa]

Active?, Done?
if active, add labels, assign and move to backlog or in progress.
if done, set release and close