Add redis functionality to stack_commons

RE: https://github.com/rackspace-cookbooks/stack_commons/issues/9

This adds redis functionality from phpstack into stacks_commons. Next commit should be adding/moving testing.
Add redis support

- Add redis functionality and write new tests (we didn't have much)
- Disable FC issue for logging guard, single include (we are adding these over time)

This addresses item 1, RE: https://github.com/rackspace-cookbooks/stack_commons/issues/9.
Version bump
Freshen tests with real content
Freshen tests with real content
Added tests for memcached recipe
Added memcached recipe
Ported attribute definition from https://github.com/rackspace-cookbooks/phpstack/blob/master/recipes/memcache.rb#L25
Bumped version, 0.0.6
Added iptables configuration to memcached
Removed boilerplate comments
Merge upstream/master
Version bump
Updated changelog
Merge pull request #19 from martinb3/master

Add redis functionality to stack_commons