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
Merge pull request #6 from afewyards/master

Refactored the layer system
changed to sass
Merge pull request #7 from afewyards/master

changed to sass
panel in seperate file
Merge pull request #8 from afewyards/master

panel in seperate file
Update readme.md
Renamed media.js to mediaLibraryItem.js and using inline template to render it
Improved html structure and styling for mediaLibraryItem
Changed the pick-file button to a square with a plus, according to design
Renamed all panel views to *Panel and moved them into 'views/panels', so we can separate ui elements into logical groups
Moved panel related sass files into a styles/panels folder, to match the js folder structure
Fixed last dependencies on old folder structure and added play button to media items
Proof of concept for playing mediaItems inside the mediaLibrary