Update launcher for java 1.6 not 1.7 Improve code to detect java location on OS X.
Update launcher for java 1.6 not 1.7
Improve code to detect java location on OS X.

Change-Id: Ic6b6adcbccc249344ea9ded28dcddad45ca87e50
Reviewed-on: http://gerrit.dmdirc.com/2758
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <79e2475f81a6317276bf7cbb3958b20d289b78df@dmdirc.com>

DMDirc/Installers,DMDirc/Installers,DMDirc/Installers,DMDirc/Installers