started refining the optimizer
expressions are compiled to proper clojure functions now
fixed bug in emit-sum. added testcases for optimize* and emit-code
fixed bug in emit-sum. added testcases for optimize* and emit-code
Merge branch 'develop' of https://github.com/clojure-numerics/expresso into develop

Conflicts:
	src/test/clojure/numeric/expresso/test_optimize.clj
constraints for elemwise operations are added during construction