release: stable-5142-3

* c2c64605 prosody: fix cross-domain WS default value
* 8261f723 jicofo,jigase: add ability to extend the config file
* 6a4887d7 web: use env variables to set worker processes and connections
* 5679578d prosody: add env var to config cross domain settings
* effb30b9 prosody: always rebuild configs on start
* 905d431e jicofo,jigasi: always rebuild configs on start
* c52b64a3 misc: working on latest