V2.0.0

[jverzani]

PR to contain breaking changes, the main one is using the type system to hold the indeterminate rather than use a field to hold the indeterminate. The advantage is this plays better with Julia's promotion mechanisms so matrices of polynomials requires much less fuss. The others are cleanups. For example, iteration is modified to more closely match iteration over the underlying container. Before, iteration iterated over terms, which is still supported though now through the iterator monomials.

• As mentioned in Just a question #308, a change for how the polynomial symbol is handled moving it from a field to a parameter of the type
• Removal of deprecated usage of Polynomial constructor to create different types of polynomials based on how the coefficients are specified. Remove LaurentPolynomial deprecations.
• Clean up how OffsetArrays are used (ok with Laurent, ignore otherwise) instead of just ignoring offset for all. Removed OffsetArrays as a dependency.
• change how collect yields terms (monomial) instead of coefficients. Try to make polynomials act like vectors as much as possible. Introduce a non-exported monomials iterator for old behaviour.
• Change type instability in integrate with NaN values
• make ErrorException errors more informative

Non-breaking changes

• Modify docstring to fit. (Had planned on changing how weights are specified [issue?], but held back)
• for integrate have methods implement integrate(p), not integrate(p,c).
  In addition, there are a few speedups to the basic operations for the ImmutablePolynomial and Polynomial types.
• Clean up promotion routes for + and *; refactor for possible reuse.
• Move code into common (truncate!, chop!, zero, one, variable, basis)

[codecov]

Codecov Report

Merging #310 (ba25a93) into master (b4dfe82) will increase coverage by 1.07%.
The diff coverage is 88.99%.

@@            Coverage Diff             @@
##           master     #310      +/-   ##
==========================================
+ Coverage   88.00%   89.08%   +1.07%     
==========================================
  Files          16       16              
  Lines        1692     1740      +48     
==========================================
+ Hits         1489     1550      +61     
+ Misses        203      190      -13     

Impacted Files	Coverage Δ
src/Polynomials.jl	100.00% <ø> (ø)
src/contrib.jl	92.42% <ø> (-1.52%)	⬇️
src/show.jl	75.75% <ø> (ø)
src/abstract.jl	40.00% <28.57%> (+16.47%)	⬆️
src/polynomials/ChebyshevT.jl	94.37% <88.88%> (-2.27%)	⬇️
src/common.jl	89.89% <88.95%> (-2.09%)	⬇️
src/polynomials/standard-basis.jl	95.91% <89.06%> (-2.23%)	⬇️
src/polynomials/LaurentPolynomial.jl	87.50% <91.37%> (+5.08%)	⬆️
src/polynomials/SparsePolynomial.jl	94.44% <92.00%> (+4.26%)	⬆️
src/polynomials/Poly.jl	81.94% <94.28%> (-7.42%)	⬇️
... and 9 more

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