Add Ubuntu 14.04 support.

This pull request adds Ubuntu 14.04 support for this cookbook. (I've only tested
the 64 bit version and only the php recipe.)

The main components of the pull request are two new resources and their
providers:

1. alien_convert: Takes the rpm package and converts it to debian.

2. alien_package: A factory type resource that behaves like the yum_package
resource on relh family platforms or like a dpkg_package resource on debian
platforms.

3. There is also an alien mixin module that I use to share some functionality
between alien_convert and alien_package resources.


At this point I have include both the alien_convert and the alien_package in
each of the recipes, however, my intention is to come back at some point in
the future and insert the alient_convert resource as a step in the alien_package
resource (I couldn't figure out how to do this in time to meet a deadline I
have).