added special case solvers for polynomials
solve dispatches now to different solving strategies which can be arbitrary core.logic relations
solve system is now capable of solving the equations on http://reference.wolfram.com/mathematica/ref/Solve.html
performance improvements through creating lists with (into '() ....) instead of (list* ....)
removed some unnecessary code
started restructuring for first release. still failing tests
updated core api for solve
Merge branch 'solve' of https://github.com/clojure-numerics/expresso into solve
fixed tests after restructuring
prepare for first release