Merge pull request #2 from afewyards/master

Structure
Merge pull request #3 from afewyards/master

update
Merge pull request #4 from afewyards/master

Added layer system
Added composition.js, which nests the player.js canvas. Adjusted dynamic layout based on percentages (for now) in scss.
Fixed scrolling media list height and disabled test background colors for ui-panels and composition
Merge pull request #5 from micros123/master

First work on layout, using more sass variables and less styling via js.
refactor of the layer model
fix
layer / trim fix