Add HTCondor-CE collector application.

This application, intended to be installed centrally, listens for
schedd ads from remote HTCondor-CE sites.
Small fixes from testing the collector.
Improve config defaults and comments.
Additional fixes for advertising the CE.
Merge pull request #27 from bbockelm/info_services

Add support for info services.
Remove GridResource lines since they're not required for non-grid
universe jobs.