Update README.md

Added getpostman.com link
181: clone environment
updating README.md with documentation pertaining to building / developing
Merge pull request #224 from neowulf33/duplicate_env

Feature 181: Clone environment
Allow undefined http response codes without breaking the app
Merge pull request #227 from jkimbo/undefined-response-code

Allow undefined http response codes without breaking the app
Trying to integrate copy to clipboard
Merged changes