JuliaDSP / DSP.jl / 1146

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Rework filter coefficients (#284)

* Add a `Domain` parameter to `FilterCoefficients`

The domain can either be `:z` for digital filters or `:s` for analog
ones.

* Support unnormalized coefficients in `PolynomialRatio{:s}`

And add some basic `freqs` tests.

* Fix PolynomialRatio for numerator/denominator of different length

And add test for unit delay as filter.

* Use polynomials in z^-1 for PolynomialRatio{:z}

* Rework PolynomialRatio constructors

Allow `PolynomialRatio{:z}(b,a)` to promote to e.g. a floating point
type for coefficient normalization but only assert normalized data in
`PolynomialRatio{:z,T}(b,a)` and do come code refactoring.

* Use `LaurentPolynomial` for `PolynomialRatio`

* Set version to 0.7.0-dev

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