Added headline template ccs for the Centre for Computational Science.
Added templates for more flexible slide counters.
- Made headline template independent of CCS
  (department/slogan templates can be set independently).
- Renamed slide counters and made current/total the default.
- Added brief examples of usage to sample.tex.
Merge pull request #1 from uschille/master

Added templates for cutomizable slide counters & headline template for CCS