Support unix and bare sockets

[akshaymankar]

Fixes #42

I am not entirely certain about using localhost as the Authority. I added support for bare sockets because it seemed easy enough.

[lucasdicioccio]

The code aspects of the patch looks good to me.

Can you:

• grep to see if some examples / the bench tool (i believe nothing does) needs updating
• add an entry to the changelog (credit yourself for the patch <3 )

[akshaymankar]

• grep to see if some examples / the bench tool (i believe nothing does) needs updating

I couldn't find anything. I compiled all the packages, nothing failed.

• add an entry to the changelog (credit yourself for the patch <3 )

I added a link to this PR.

[lucasdicioccio]

Thank you Akshay!

The build before the doc+changelog commits worked, it looks like it timed out this one time. Restarting it would likely mostly waste resources at Travis => merging that.