[boost] Assistance debugging compile time isomorphism failure to get PR #114 working

Hello all, Since Saturday I've been banging my head against this one. Over at https://github.com/anadon/graph/tree/isomorph-fix I've been trying to fix some of the newly enables travisCI failures. I'm getting a persistent type mismatch that may not be resolvable sanely, but I want to get another set of eyes before I just the gun and start suggesting ripping out tests.