Balancer base code, part 1 #87
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Adjusting the ConstantProductCurve class to also allow for certain Balancer-like curves. More specifically, the class will allow for a weight parameter alpha = 0..1 where alpha = 1/2 is constant product, and more generally the invariant is x^al y^1-al = k^al.
This is in preparation for allowing certain Balancer curves to be treated within the Fastlane framework. Note that the CPC class will never be able to accommodate more than two assets. Also, for the Optimizer framework this is somewhat overkill is we only need x(p), and CPC adds much more.
Note: also adds some documentation. and cleans the area, and adds the tests