Added support for Scientific Linux 6+ via osfamily fact.

This requires facter 6.2, which perhaps should be mentioned in the README.
http://projects.puppetlabs.com/projects/facter/wiki#New-fact-6792-Added-osfamily-fact

Also specify empty namespace for osfamily per style guide.
http://docs.puppetlabs.com/guides/style_guide.html#namespacing-variables
Updated README.md as well.
Merge pull request #3 from jbarbuto/scientific_linux_support

Added support for Scientific Linux 6+ via osfamily fact.
add puppet version dependency info
refactoring to match http://docs.puppetlabs.com/guides/style_guide.html
add Rdoc documentation for puppet doc
change download exec from wget to curl on redhat, because curl is teh redhat default http downloader
fix typo in package name
add more requirements to the documentation
Merge pull request #1 from echocat/master

update this fork