Add in rspec tests for ntp class

This commit adds in rspec tests for Debian, EL, SuSE and Solaris
as well as tests for unsupported OS types.  It also checks for
valid template generation of each type.
Enable testing with Travis-ci.org
Merge branch 'rspec_tests' of git://github.com/ebrdann/puppet-module-ntp into spec_tests
Fix formatting of spec test
Add Hiera to Gemfile to support Travis
Merge pull request #9 from ghoneycutt/spec_tests

Spec tests