modified cvxpy to be consistent with new ECOS interface

Once the new ECOS interface is implemented, this change will be necessary to be consistent.  This will allow the argument ABSTOL, RELTOL, FEASTOL, ABSTOL_INACC, RELTOL_INACC, FEAST_TOL, MAX_ITERS, and VERBOSE to be set using the solver_specific_opts dictionary.  The verbose argument will be removed from the python interface to ECOS.