refactor lumen.js

[nandaloo]

lumen.js should be refactored into multiple modules for the independent parts of its content:

• move class InfoBox into /app/widgets/InfoBox.js
• move class AlertBox into /app/widgets/AlertBox.js
• move class ShelfSwapper into /app/widgets/ShelfSwapper.js
• move class Toolbar into /app/widgets/Toolbar.js
• move class ModelSelector into /app/widgets/ModelSelector.js
• move DetailsView into /app/widgets/DetailsView.js
• move SurveyWidget into /app/widgets/SurveyWidget.js
• move GraphWidgetManager into /app/GraphWidgetManager.js
• move Context into /app/Context.js
• move ContextQueue into /app/ContextQueue.js