v3.0.0 - complete overhaul for v2 API

[Justintime50]

• Updates entire library to be compliant with the new v2 API (endpoints, HTTP methods, etc)
• Build requests via a Client now providing your email and api_key
• Added optional base_url and timeout options to client
• Module names are now plural
• The Client now checks if an email and api_key is provided and raises an error if not
• Removed utils module (pretty print)
• Added unit tests (closes Updated name scheme to match other CL's #1)