Force the use of HTTPS in source and destination URL flags

[shawnHartsell]

In commands where a source/destination URL can be present, clients can provide any support git url. When using HTTP the HTTP protocol, if https is not used then clients will encounter errors such as those reported in #96.

To prevent these kinds of issues, we should force the use of https for all flags (when provided) and return an error back to clients if URLs use http