[ZF3] Service Manager Cleanup

Here's my made-up roadmap for ZF3's ServiceManager:

 - [ ] Removal of aliases
 - [ ] Compatibility layer for ZF2 ServiceManager aliases (for those who really really need them ?!)
 - [ ] Removal of canonical names
 - [ ] Compatibility layer for ZF2 ServiceManager canonical names
 - [ ] Removal of `retrieveFromPeeringManagerFirst` support (no polyfill/not used in the framework itself)
 - [ ] Removal of peering service managers as a native functionality
 - [ ] Compatibility layer for ZF2 ServiceManager peering service managers
 - [ ] Change of interfaces to remove the `$cName` and `$rName` differentiation. Now `$rName === $cName`

See the changes in the tests for a good overview of what I broke.