[Feature Request] Add a convenience macro for making Polynomials

[AwesomeQuest]

It would be nice if there where a convenient way to make a Polynomial without having to write out every time "Polynomial"

For instance, including something like:

macro P_str(s)
    Polynomial(eval(Meta.parse("["*s*"]")))
end

Makes it easy to make a Polynomial like so:

julia> P"1,2,4,5,6"
Polynomial(1 + 2*x + 4*x^2 + 5*x^3 + 6*x^4)

[jverzani]

Hmm, we recently added a macro @variable to make a variable easier to type. Maybe adding an @poly 1 2 3 4 5 would be helpful. I have to see if there are other uses in the many other Polynomial packages so as not to be too conflicting.

[jverzani]

This might be best left to an example, the code can be as simple as:

 macro poly(as...)
     Polynomial(as)
end

Would you like to add this to the documentation somewhere?

(Though the above exposes an issue with promotion when arguments are passed as a tuple.)