ENYO-2091, ENYO-1277: define & use FsBase.normalize(), fix `path:`  property definition 

Tested on Windows/x64 using Chrome.

Depends on https://github.com/enyojs/nodejs-module-webos-ipkg/pull/28

* ENYO-2091, ENYO-1277: define & use FsBase.normalize(), fix `path:`  property definition 
* ENYO-2091: update dev workspace maintenance instructions

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>