Removed apiVersion validation - not all charts follow this requirement

Replaced assertions with error logging

Merge pull request flaper87#67 from flaper87/add-appVersion

Added support for additional metadata fields (apiVersion and appVersion)

Encode chart contents and fix relevant tests

Updated code and tests to use yaml's safe_load

Merge pull request flaper87#60 from flaper87/list_releases_with_names…

…pace_and_statuses

List releases with namespace and statuses

Merge pull request flaper87#56 from justinturpin/master

Secure GRPC TLS Support

Merge pull request flaper87#43 from avorima/unit_tests

Add unit tests

Prevent entering an infinite loop when attempting to fetch releases w…

…hen no releases are installed

Merge branch 'master' of https://github.com/flaper87/pyhelm