Allow multi-dimensional dirichet #843
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The resulting variables summed over the first axis will be one.
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This alters the StickBreaking transformation to allow for multi-dimensional Dirichlet object. This should resolve #792 . The first dimension is treated as special and the sum along this dimension of the resultant variables are consistenlty one. Both the log(p) and the jacobian of the transformation are now multi-dimensional array with summation only over the first dimension, which means that a useful logp_elemwiset is created.