Fix newrelic testing based on upstream

Fixes #67, upstream released a new version of the newrelic meetme agent cookbook, switching to LWRPs for some pieces of functionality we were testing in chefspec. This commit moves those to serverspec tests, and also removes the extraneous testing of distros where we didn't check any differences. I also added some guards for recipes that didn't like being converged with 'demo' set to true but with nginx enabled (the demo was only working w/ apache).
Rubocop likes spaces
Changelog update
Add more guards to newrelic recipe
Rubocop more spacing
Block nesting too deep
Removing serverspec newrelic tests, they won't converge on real server due to newrelic
Merge pull request #68 from rackspace-cookbooks/fix_newrelic

Fix newrelic testing based on upstream