Implement type and provider for package.env
Add tests for the package.env type and provider
Add a README entry for package.env
Add default values for :use, :env and :keywords
Add test case for when the keyword is missing
Merge pull request #81 from vikraman/package_env

Type and provider for package.env
Merge pull request #84 from vikraman/fix/defaults

Set defaults for package_* types