Rename titan-release profile to aurelius-release

This change makes the profile match the name of the equivalent profile
in Faunus's pom.xml file
Removing IDAuthority's peekNextID method

In the consistentkey backend, this peek method could skip valid
blocks, limiting its usefulness.  It deosn't appear to be used
anywhere outside a single test method, so I deleted the method from
both its interface and implementations.

In the consistentkey implementation of IDAuthority, the process of
allocating a block happens in approximately two steps.  1. Write the
backend to claim an ID block.  2. If the write took longer than a
certain configurable time limit, try to delete it, otherwise return
the block as successfully allocated.

The problem: "peek" just looks at written claims.  If peek happens
after a write completed but before the responsible machine deletes it,
then peek will consider it allocated and skip it.  A subsequent call
for the next block may then return a start less than what peek
reported.

If we come up with a genuine need to peek at ID blocks, then we'll
need to modify the consistentkey implementation to avoid this behavior
(unless we can live with it, somehow).