[WIP] V3 Next version IN PROGRESS

[ryuran]

V3 Work in progress

⚠️ DO NOT MERGE ⚠️

• [x] transform gsk to a node_modules usable as dependency of a project
• [x] add script to initialize a project with gsk
• [x] install dependencies related to config (html and css builder) in init script.
• [x] transform engine html and css to node package to keep init dependencies easier
• [ ] rewrite documentation “How to install and use”
• [ ] add test with travis
• [ ] support node 6.4 to stable
• [ ] translate doc to english