Initial RHEL support for the Java gateway. Still to do :

* Finish Debian support (mainly init script)
* Get chef to notice when service is down and start up
Debian init script fixes & Install java JDK during server build

* Init script uses bash (instead of bourne shell "sh")
* Calls "java" default recipe
Don't re-add "--enable-java" if it is already present.
Make the RHEL init script more robust.

* Might make future PR converting everything to systemd/upstart/runit/etc
Remove spurious whitespace from java gateway Debian init script
Finish incomplete comment in init script
Add yum-epel dependency
Merge pull request #140 from ftclausen/zabbix-java-gateway-server

Support for managing the Zabbix Java Gateway.