ENYO-2935: raise the limit of parts acceptable by `express@3.4.*`

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-2935: Git-ignore the dependency on `graceful-fs`

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-2935: use the list of files from `Generator#generate()`…

…rather than rebuilding it from a target tree.

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>