Initial commit on face

[WhatsARanjit]

Added a face to cover the endpoints available to the classifier API:

• classes
• classified
• environments
• groups
• unpin

For the moment, the idea is to be read-only- used for query purposes only. The unpin endpoint is the only endpoint that changes anything. The reason being, I'm aiming to encourage changes through DSL instead of using the face. However, if users would rather just update using the face, I'd be open to adding something like the following:

# puppet node_manager groups 'My Group' \
--classes '{ "foo" => {} }' \
--variables '{ "key" => "var" }'

...in order to update a group. But this can be accomplished using the RAL in any case:

# puppet apply -e 'node_group { "My Group": classes => { "foo" => {} }, variables => { "key" => "var" }, }'