ENYO-1783: Put in place Ares plugin mechanism

* ENYO-1783: Added plugin-ares-* in .gitignore
* Merge branch 'master' of github.com:enyojs/ares-project into ENYO-1783
* ENYO-1783: Put in place plugin mechanism
* ENYO-1783: Renamed project gen into prjToolkit
* ENYO-1783: Renamed project gen into prjToolkit

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>