fixes #73 allowing chocolatey to install on older chef clients

CHANGELOG.md

 # Changelog for Chocolatey cookbook
 
+### v0.6.2 (2016-01-07)
+
+* Fix Chocolatey detection on chef clients older than 12.4.0
+
 ### v0.6.1 (2015-11-24)
 
 * Fix LocalJumpError on existing chocolatey package

libraries/helpers.rb

 module Chocolatey
   module Helpers
+    # include the PowershellOut module from the windows cookbook
+    # in case we are running an older chef client
+    include Chef::Mixin::PowershellOut
+
     # Get the ChocolateyInstall directory from the environment.
     def chocolatey_install
       ENV.fetch('ChocolateyInstall') { |env_var| machine_env_var(env_var) }

metadata.rb

@@ -4,7 +4,7 @@ maintainer_email 'guilhem.lettron@youscribe.com'
 license          'Apache 2.0'
 description      'Install chocolatey and packages on Windows'
 long_description 'Installs the Chocolatey package manager for Windows and provides a Chef resource for installing nuget packages from https://chocolatey.org/'
-version          '0.6.1'
+version          '0.6.2'
 
 source_url 'https://github.com/chocolatey/chocolatey-cookbook' if defined?(:source_url)
 issues_url 'https://github.com/chocolatey/chocolatey-cookbook/issues' if defined?(:issues_url)