ENYO-2063: adapt to Node.js 0.10

Tested on OSX. I do not expect any change on Linux or Windows.

**Demands** Node.js 0.10 (See https://enyojs.atlassian.net/browse/ENYO-2063 for details).

* ENYO-2063: clean-up needless `nodejs@0.8` code path (HEAD, origin/ENYO-2063, ENYO-2063)
* ENYO-2063: update npm dependencies & associated shrinkwrap
* ENYO-2063: use new patched node-unzip (0.1.7 + changes) for nodejs@0.10
* ENYO-2063: re-add node-unzip as submodule
* ENYO-2063: improve the overwrite, split fetch+unzip
* ENYO-2063: remove dependency on patched node-unzip

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>