PLAY-29 multisite capability

Created by: ssokolenko

• PLAY-29: Multisite - work in progress.

• PLAY-29 PLAY-73 Adjust docker setup to support multidomain feature of the play-cms

  • add proxy container with two sites configured
  • update play-cms version
  • remove bash.sh because it does not work (does not bind exposed ports)
  • make proxy bound port configurable when starting containers

• PLAY-29 PLAY-73 Add rew site aliases to docker.conf for more flexibility during development

• PLAY-29 PLAY-73 Fix the wrong syntax of cms.sites definition in docker.conf

  • cms.site=null make sure the configs from application.conf are not merged with docker.conf
  • quote hosts array values as ":" has special meaning in conf files

• PLAY-29 Fix warning about unset SBT_OPTS env var when in app.sh

• PLAY-29 PLAY-73 Add alternative config keys into application.conf

• PLAY-29 PLAY-78 Add an example of using different templates and layouts for each site

• PLAY-29 Update to play-cms v2.1.1