[Halld-offline] gluex_install for Ubuntu 14.04

[Mark M. Ito]

Folks,

I've add a pre-requisites script for Ubuntu 14.04 to the gluex_install 
package. This version has differences from the script that worked for 
Ubuntu 12.04. See

https://halldweb1.jlab.org/wiki/index.php/Scripts_for_Installing_GlueX_Software

for documentation. Work was motivated by Beni going to this version on 
his desktop.

   -- Mark