Chaospy

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FIXED:
* Gamma pdf and moment breaks down for large values of alpha.
Switching to new scipy formula.

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FIXED:
* Compatibility with `numpoly`: Bug workaround in polynomial division.
Only affects numpoly v1.2.3 and generating polynomials with `normed=True`.

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FIXED:
* Compatibility with `numpoly`: Update string key access to `ndpoly` objects.

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Refactoring `orthogonal -> expansion` module.

ADDED:
* Dedicated classical orthogonal expansion schemes:
`chaospy.expansion.{chebyshev_1,chebyshev_2,gegenbauer,hermite,jacobi,laguerre,legendre}`
CHANGED:
* Function renames:
`chaospy.{orth_ttr,orth_chol,orth_gs,lagrange_polynomial} ->
chaospy.expansion.{stieltjes,cholesky,gram_schmidt,lagrange}`
* Docs update.

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Refactoring `quadrature` module.

ADDED:
* `chaospy.quadrature.fejer_1` is added.
* Dedicated classical quadrature schemes:
`chaospy.quadrature.{chebyshev,gegenbauer,hermite,jacobi,laguerre,legendre}`
CHANGED:
* Bound checks for the triangle distribution. (Thanks to yoelcortes.)
* Refactored hypercube quadrature to common backend. This gives lots of flags
like `seqments` and
* Function renames:
`chaospy.quad_{clenshaw_curtis,discrete,fejer,gaussian,grid,gauss_lengendre,gauss_kronrod,gauss_lobatto,gauss_patterson,gauss_radau} ->
chaospy.quadrature.{clenshaw_curtis,fejer_2,gaussian,grid,legendre_proxy,kronrod,lobatto,patterson,radau}`
* Patterson growth rule changed from `0, 3, 7, ...` to `0, 1, 2, ...` but
maps backwards. Defaults to not have growth parameter, as setting it false
makes no sense.
* Renamed: `chaospy.generate_sparse_grid -> chaospy.quadrature.sparse_grid`
REMOVED:
* Genz-Keister quadrature `quad_genz_keister` is deprecated as it does not
fit the `chaospy` scheme very well.

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ADDED:
* Support for approximate multivariate raw moments.