Changes in version 1.0-0 (5/24/14)
    * added D-Stream (with attraction)
    * improved support for creating animations
    * tnn: new decay models, tNN without shared density now reclusters 
        using density reachability
    * plot gained the type "both" that plots micro and macro-clusters
    * DSC_Hierarchical and DSC_Kmeans gained min_weight to filter low weight
        micro-clusters before reculstering
    * removed default radius, etc. for most clustering algorithms
    * Added DSD_MG for simulating treams with concept drift
    * moved MOA related code to streamMOA
    * suspended DSC_BIRCH because of memory issues
    * reset_stream gained a pos argument

Changes in version 0.2-0 (2/21/14)
    * major restructuring

Initial version 0.1-1 (8/16/13)
