`create` support (Basic)

[steve-r-west]

The create command will eventually have the following semantics.

create <RESOURCE> [PARENT_ID_1] [PARENT_ID_2]... <KEY> <VAL> <KEY> <VAL>

Some examples

epcc create customer email "test@test.com" name "John Smith"
epcc create password-profiles 667d7853-9a71-490f-abed-8f0ef2f82541 name "Password authentication 2" username_format email

Acceptance Criteria

For now because we don't have #3 working, we will only focus on top level resources, and not worry about how to do password profiles.

1. Calling epcc create <X> key val should post to /v2/<X> and using the code from test-json command support #16 , post the JSON array as a body.
2. Any http error codes should be shown to the user, and return a non 2xx response should return non zero to the OS.