v0.3.0

New

• This adds a new type System for polynomial systems.
• JacobianConfig and GradientConfig can now be constructed by config(F, x) where x is representative with which F should be evaluated.
• A new function evaluate_and_jacobian[!] to evaluate F and its Jacobian at the same time.

Breaking

• JacobianConfig, evaluate, evaluate!, jacobian, jacobian! now expects a System instead of Vector{<:Polynomial}