Add explicit Ubuntu support.  Add Gentoo support.
fix deprecated warning for include_class / contain_class
adding support to specify a specific version of the package to be installed, instead of the default available on the system
Merge pull request #22 from dealnews/pr_ubuntu_gentoo_support

Add explicit Ubuntu+Gentoo support
Merge pull request #24 from CpuID/develop

Fix deprecated spec warning + Add support for specifying a specific package version to install.