ENYO-3285: enable Ares to handle huge templates

Tested Ok on OSX 10.8.5, with Node.js 0.10.20

* ENYO-3285: do not build every input streams upfront, but upon need (HEAD, origin/ENYO-3285, ENYO-3285)
* ENYO-3285: genZip filter-out file names before substituting variables...

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>