Add spec tests for pe_version facts
user
```ruby
#!/usr/bin/env rspec

require 'spec_helper'

describe "PE Version specs" do
  before :each do
    Facter.collection.loader.load(:pe_version)
  end

  context "If PE is installed" do
    %w{ 2.6.1 2.10.300 }.each do |version|
      puppetversion = "2.7.19 (Puppet Enterprise #{version})"
      context "puppetversion => #{puppetversion}" do
        before :each do
          Facter.fact(:puppetversion).stubs(:value).returns(puppetversion)
        end

        (major,minor,patch) = version.split(".")

        it "Should return true" do
          Facter.fact(:is_pe).value.should == true
        end

        it "Should have a version of #{version}" do
          Facter.fact(:pe_version).value.should == version
        end

        it "Should have a major version of #{major}" do
          Facter.fact(:pe_major_version).value.should == major
        end

        it "Should have a minor version of #{minor}" do
          Facter.fact(:pe_minor_version).value.should == minor
        end

        it "Should have a patch version of #{patch}" do
          Facter.fact(:pe_patch_version).value.should == patch
        end
      end
    end
  end

  context "When PE is not installed" do
    before :each do
      Facter.fact(:puppetversion).stubs(:value).returns("2.7.19")
    end

    it "is_pe is false" do
      Facter.fact(:is_pe).value.should == false
    end

    it "pe_version is nil" do
      Facter.fact(:pe_version).value.should be_nil
    end

    it "pe_major_version is nil" do
      Facter.fact(:pe_major_version).value.should be_nil
    end

    it "pe_minor_version is nil" do
      Facter.fact(:pe_minor_version).value.should be_nil
    end

    it "Should have a patch version" do
      Facter.fact(:pe_patch_version).value.should be_nil
    end
  end
end
```
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