[#1596] Allow override of advanced proxy IP checking

[#1596] Advanced proxy does not work for proxies whose IP is not defined  - added TEST and Documentation
[#1596] make change compatible with change already on branch 1.2.x / 1.3.x (all vs ALL)
See https://play.lighthouseapp.com/projects/57987/tickets/772-overwritten-of-cache-control-header-when-apply-renderbinary-to-a-file
[#772]
Fix exception when application.mode is something else then DEV or PROD
[#1593]

[#1593] Don't default to dev mode : Make it a fatal error
Switch JDK to 1.6
[#1636]
Upgraded to async-http-client 1.7.8