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ADDED:
* Rudimentary alignment of shape, indeterminants and exponents.
* Numpoly baseclass `ndpoly` with basic call functionality and interface
for dealing with numpy interoperability.
* Numpy functions: `absolute`, `add`, `any`, `all`, `array_repr`,
`array_str`, `concatenate`, `cumsum`, `divide`, `equal`, `floor_divide`,
`multiply`, `negative`, `not_equal`, `outer`, `positive`, `power`,
`subtract`, `sum`.
* Polynomial functions: `diff`, `gradient`, `hessian`, `to_array`,
`to_sympy`, `to_string`, `monomial`, `symbols`.