Numpoly

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ADDED:
* Numpy function additions: `ediff1d`, `full`, `full_like`, `copyto`.

==========================

ADDED:
* Polynomial constructor: `polynomial_from_roots`.

==========================

ADDED:
* Tests for `numpoly.equal`.
* Numpy function additions: `result_type`, `diff`.

CHANGED:
* First iteration for deprecating `align_shape`:
* Added common `assert_equal` function to test contiguous-ness, shape,
dtype etc. in a more automated way.
* Small patches here and there to assert contiguous-ness.
* Rename single variable differentiation:
`diff -> derivative` (as the former is reserved in numpy).

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ADDED:
* Pickle support.
* Polynomial function: `lead_coefficient`.
* (Unwrapped) numpy functions: `load`, `loadtxt`.
* Numpy function additions: `save`, `savetxt`, `savez`, `savez_compressed`.

CHANGED:
* Rename function `largest_exponent -> lead_exponent`.

FIXED:
* Bugfix: Poly-division with large relative error caused infinity-loops.

==========================

ADDED:
* Numpy function additions: `diag`, `diagonal`, `ones`
* Added changelog (the file you currently are reading).

==========================

FIXED:
* Bugfix in `set_dimensions` (1.0.2 solution didn't work).