Adding nginx header proxy support.
Adding nginx header proxy support.

dsrowell/dokku-alt,bewest/dokku-alt,mehulsbhatt/dokku-alt,dsrowell/dokku-alt,bewest/dokku-alt,bewest/dokku-alt,beedesk/dokku-alt,dokku-alt/dokku-alt,stnly/dokku-alt,dokku-alt/dokku-alt,netbrick/dokku-alt,dsrowell/dokku-alt,mehulsbhatt/dokku-alt,stnly/dokku-alt,beedesk/dokku-alt,netbrick/dokku-alt,mehulsbhatt/dokku-alt,stnly/dokku-alt,dokku-alt/dokku-alt,stnly/dokku-alt,vfulco/dokku-alt,bewest/dokku-alt,beedesk/dokku-alt,dsrowell/dokku-alt,netbrick/dokku-alt,stnly/dokku-alt,stnly/dokku-alt,beedesk/dokku-alt,vfulco/dokku-alt,mehulsbhatt/dokku-alt,bewest/dokku-alt,beedesk/dokku-alt,netbrick/dokku-alt,dsrowell/dokku-alt,vfulco/dokku-alt,stnly/dokku-alt,vfulco/dokku-alt,netbrick/dokku-alt,bewest/dokku-alt,netbrick/dokku-alt,dokku-alt/dokku-alt,dsrowell/dokku-alt,bewest/dokku-alt,mehulsbhatt/dokku-alt,mehulsbhatt/dokku-alt,dsrowell/dokku-alt,dokku-alt/dokku-alt,dokku-alt/dokku-alt,beedesk/dokku-alt,dokku-alt/dokku-alt,dsrowell/dokku-alt,netbrick/dokku-alt,vfulco/dokku-alt,beedesk/dokku-alt,netbrick/dokku-alt,vfulco/dokku-alt,stnly/dokku-alt,mehulsbhatt/dokku-alt,dokku-alt/dokku-alt,vfulco/dokku-alt,mehulsbhatt/dokku-alt,vfulco/dokku-alt,bewest/dokku-alt,beedesk/dokku-alt