Prevent NPE for file diagnostics without line number
Use more recent version (4.0.0.beta5) of Google Guice
Improve test of SLL cipher
(GEP-213) Connections to Forge fails behind proxy

The Forge API server switched to use https a while back. That didn't
work with proxies since Geppetto only triggered on configuration for
http (and not https) proxies. This commit rectifies that.