Port `hub am` tests to cukes
Port `hub apply` tests to cukes
Port `hub init` tests to cukes
Uncomment accidentally disabled step in `browse` cukes
Port `hub push` tests to cukes
Fix `hub browse` help output when not in any repo
Port `hub browse` SSH-related scenarios to cukes
Merge pull request #597 from github/cukes-galore

Port a bunch more tests to cukes