Metaswitch/sprout — pull request #645 by bossmc (2014-07-10 15:56:41+00:00)
Title: Reviewer Rob - Contact filtering

This is the code for the contact filtering function.

I've UT'd everything but `filter_bindings_to_targets`, `binding_to_target` and `prune_targets` but the golden paths through them are already UTd by the existing UTs. I'll add error paths while you review the rest.