Tons of fixes

### Summary ###
I needed to accomplish two things:
 1. Incorporate librarian version 0.0.26 to get its improvements for handling proxies
 1. Update forge.rb to use a proxy in a similar fashion found in vendor/librarian/lib/librarian/chef/source/site.rb.

### Remarks ###
I would prefer to see vendor/librarian become a git submodule. However, since my time on working with this project has been very short, I didn't want to make such a change just yet.  The changes to forge.rb are what I really needed. Those should definitely be preserved.