ENYO-1783: Put in place Ares plugin mechanism

* ENYO-2026: By default use the last build service
* Merge branch 'master' of github.com:enyojs/ares-project into ENYO-1783
* ENYO-2026: Append plugin's ide.json to the main ide.json at startup
* ENYO-2026: Fixed substitutions issues while creating a new project
* ENYO-2026: Changed project generation service name to 'generate'
* ENYO-2026: Changed project generation service name to 'generate'
* Merge branch 'master' of github.com:enyojs/ares-project into ENYO-1783
* ENYO-2027: Fixed file corruption caused by fs.createReadStream some some files.
* ENYO-2027: Simplified the FormData generation
* ENYO-2027: FormData are now filled with base64 data to avoid arbitrary encoding done by the browser
* ENYO-2040: Fixed issue on IE9 with window.open
* ENYO-2027: Added testRunner cases about getFile() of binary files
* ENYO-2026: Fixed typo in .gitignore
* ENYO-2026: Refined ares-plugin definition
* 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>