v2.0.0

• Replace the Tsne class with the initialize() function that takes an Options argument, which is more intuitive.
• Removed all top-level run() functions. Users are expected to call status.run() on the Status object returned by initialize().
• Switch to the latest knncolle interfaces.
• Replace interpolation with leaf approximation, which computes the repulsive forces directly on the centers of mass for the leaf nodes. This is a more natural approximation that extends easily to any number of dimensions.
• Bugfix to non-edge force calculation for the leaf node containing the current point of interest.
• Explicit handling of duplicate points to avoid recursion up to the maximum depth.
• The Barnes-Hut approximation criteria is updated to use the full width rather than the half width. theta is set to a default of 1 to compensate, so that the results don't change much in the default case.