Improve readability of .travis.yml puppet invocation
Stop using $BASE variable in .travis.yml
112 - Establish hiera/environment setup
112 - Establish hiera/environment in puppet-node-classifier.rb
112 - Link RSA with Wikipedia in README.md
112 - Extend Makefile to cover hiera/environment during distclean
Merge branch '112-rearrange-hierarchy' into 112-external-node-classifier