No longer depend on lsb* facts for portability.

resolves issue #57. Changed all instances of lsbmajdistrelease and
lsbdistid to operatingsystemmajrelease and operatingsystem respectively.
lsb facts require specific lsb packages from the OS repos.
Spelling fix in README
Support Ruby v2.0.0
Release v2.0.0 - Requires Facter >= 1.7.0