Addition of --read-proxy to facilitate PROXY -> xff translation

I've taken the functionality added by the jimbly/stud fork and added it to your fork of stud.  It allows stud to ingest a PROXY line and change the remote_ip value on proxystate so that it will be the address printed out when writing out the x-forwarded-for header.  I've also made minor changes to the Makefile as well as a change to the README.md to point people at the bumptech repo instead of making statements about reliability on my own repo.