Merge pull request #10 from andyshinn/no_custom_installers

The --no-custom-installers ption is deprecated in favor of --no-plugins
Merge pull request #11 from andyshinn/refactor_download_method

DRY up the composer binary download code a bit
Bumping version to 0.1.1
Merge branch 'master' of github.com:tPl0ch/puppet-composer
add a composer_home fact and use it to set up environment