Added Pidora OS Name and Family Mappings

Added correct mappings for os grain and os_family grain under Pidora.  Pidora is based on the Fedora Project compiled specifically for the ARMv6 architecture used on the Raspberry Pi.  Here is the [wiki](http://zenit.senecac.on.ca/wiki/index.php/Pidora).  

It will be displayed like this from grains:
```bash
    os:
        Fedora
    os_family:
        RedHat
    oscodename:
        Raspberry Pi Fedora Remix
    osfullname:
        Pidora
    osmajorrelease:
        - 18
    osrelease:
        18
```