server: read -conf flag before reading stdin config 

tls: suggestion - disable tls if port is http?

core: Add the option to specify what address to bind on in Caddyfile

proxy: Refactor so that other upstream backends can be implemented

adding crypto/tls sessioncache

Refactor proxy middleware so that 1.) From() is exposed 2.) Other upstreams can be implemented/plugged in

Proxy Middleware: Add support for multiple backends, load balancing & healthchecks

config: format string fixes from vet