v0.3.0

• #454 Update lasso example
• #473 Matmul now will not split any of the input matrices if both have split=None. To toggle splitting of one input for increased speed use the allow_resplit flag.
• #473 dot handles 2 split None vectors correctly now
• #470 Enhancement: Accelerate distance calculations in kmeans clustering by introduction of new module spatial.distance
• #478 ht.array now typecasts the local torch tensors if the torch tensors given are not the torch version of the specified dtype + unit test updates
• #479 Completion of spatial.distance module to support 2D input arrays of different splittings (None or 0) and different datatypes, also if second input argument is None