Merge branch 'release/4.3.0' into develop
Use puppetlabs-stdlib 2.6.0 for testing.
Added manage_repository parameter.

Whether to allow the yumrepo to be manged by the Puppet module or out of
band (ie RHN Satellite). Addresses Issue #11.
Update README.md about manage_repository parameter.

Also switched from GFM for code snippets back to standard Markdown.
Updated README.md.
Fix Markdown code blocks in README.md.
Update versions for 4.4.0 release.
Merge branch 'release/4.4.0'