Update .travis.yml, Gemfile, Rakefile, and CONTRIBUTING.md
Add json gem

The puppet_facts gem implicitly depends on the json gem.
On Ruby 1.8.7, json is not built in. On Puppet 2.7, it is
not explicitly pulled in by the hiera gem. So we add it
here explicitly.
Merge pull request #956 from cmurphy/master

Update .travis.yml, Gemfile, Rakefile, and CONTRIBUTING.md
acceptance: add test for actual port
Fix apache::mod::version title

written as apache::mod::reqtimeout
Merge pull request #959 from DavidS/add-ports-test

acceptance: add test for actual port
Merge pull request #960 from sathieu/patch-1

Fix apache::mod::version title
add mod_security apache module
Merge pull request #948 from jlambert121/mod_security

add mod_security apache module