feat(client): Teach option flag for tracing requests

_From @bacongobbler on January 12, 2015 16:59_

An option flag to trace requests would help users understand how communication between the client and the server occur, as well as help understand where a connection issue may occur, such as in a proxied environment or if DNS routes are set up incorrectly.

Common client option flags would be `--debug`, `--verbose` or `--trace`. I'm personally in favour of `--verbose` as typically you can tune the verbosity up or down based on your needs.

_Copied from original issue: deis/deis#2884_