Feature/tracer v2

- Introduces native HTML canvas implementation as an alernative to Kinetic - without braking the app :) and optional (AppConfig setting)
- Moves nuKinetic directive into isolated scope
- Adjusts shapechange event emission (now happens on shared isolated childscope)
- Drawing with Kinetic now on tmp layer, on finish merged to main layer (solves issue #14, costly at preload though)