Dev environment : JSHint will raise error if trailing whitespace
Layers:Review:Only one selector per line
Layers:Review:Renamed layers canvases css classes to layers-above/below-canvas
Layers:Review:Changed FrameRenderer className property to classes (array)
Layers:Review:Rename renderers frame up/down to above/below
Layers:Review:Renamed layers-container to layers-list-container. Extracted URLs to Constant.js
Layers:Review:Added todos in cheap-templates.js
Layers:Minor style changes