Setup spec infrastructure and a first test

Base class tests done (incl. parameter validation)

91 rspec tests. Covering all sub classes as well
Fixed Rakefile for TravisCI
Fix tests for 2.6.x
Exclude 1.9.3/2.6.14 from build matrix
Merge pull request #2 from dkerwin/feature/rspec_tests

Test coverage by rspec-puppet and puppetlabs_spec_helper integration