Fixes and features

New features:
 - added plugin for default RTE (thanks Andrew!) - issue #8
 - added runtime environments (GLITE/PROXY)
 - added fact for ARC CE version
 - added custom fixes

Updates:
 - added a bit of documentation
 - updated the nordugrid repository from 13.02 to 13.11
 - merged manifests/config/* with manifests/config.pp

Fixes:
 - fixed URL for APEL testing queue

This pull request is not yet ready to merge, please wait until I can test it.