v2.0

[nliautaud]

• Fix layout issues
• Use Gulp and inline sources
  • add package.json and gulpfile.js
  • use build process : separated development sources files in src/, output bundled story.html
  • inline all scripts with gulp-inline-source : no more sibling directory
• SVG drawing editor
  • Use SVG instead of canvas base64 bitmaps (svg.js & svg.draw.js)
  • Toolbar: color picker, stroke sizes and tools (freehand pen / line)