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.