update README
Manage firewall entries
Add ability to manage firewall

Original idea and entries of firewall resources by Adam Boeglin.
Add rake tasks for validation and linting
Add support for Puppet v3.4
Resolving conflicts with upstream
Addressing simple style fixes
Travis will check for syntax validation and style before specs
Merge pull request #34 from ghoneycutt/add_firewall

Add firewall
add support for Amazon Linux
Update module version to 2.3.0
Merge branch 'amazon'
update module version to 2.4.0