Convert from symbols to strings

FC001
Mode doesn't need to be a string
Upgrading core services on a Chef run is a really bad idea.  Let users do this in maintenance windows if they choose
Don't upgrade the memcached dev package either
Max connections doesn't need to be a string
Switch to platform_family to add support for Amazon/Scientific/Oracle Linux
Spell family correctly (whoops)
Add amazon and scientific to the metadata
Include the EPEL recipe on rhel platform versions less than 6.0
Change symbols to strings in the readme
2 space format the templates so they're easier to read and match the rest of the recipe
Merge branch 'COOK-1469'