Remove any classes that implement InternalAPI or Account.
So that we can rely on it when Things Get Tough.  We're gonna need this in a bit.
RollupType fixes

1. create a non-type for non-rollups that implement Rollup. (Go figure!)
2. Make sure that histograms are included in classOf implementation (makes it hard for SafetyTTLProvider to be safe!)
augment Rollup to supply RollupType
use ttl providers everwhere.

We currently use SafetyTTLProvider, but should switch to something supplied at runtime.
get rid of TtlCache and its ilk.
Merge pull request #237 from gdusbabek/remove_internal_api

Remove InternalAPI, TTLCache and all their miasmal friends