protect default values
Add ssh_options attribute to the SCP storage.

This allows the usage of all available Net::SSH options.

closes #481
Fix pipeline error messages

* On OS X Error Code of zero does not return Success

closes #484
ignore the rvm version and gemset files

closes #485
use strings for query options

closes #487
Release v3.7.2
Merge remote-tracking branch 'meskyanichi/master'