Improved DOM rendering performance with new version of Marionette.js

Slight implementation changes, removed redundant API method, apply 'i…

…os-device' class to body

Hooks support, massive refactoring of store model API, encapsulate st…

…ore model in plain JS object instead of Backbone object

Highlight all button active states, add template object, improve zoom…

… calculations, add device ID to Soomla dialog

Refactor views intensively and extract them to separate modules, dete…

…ct transitionend event, wrap Marionette modules

Upgrade Less (due to Leap of Fangs error), error handling on duplicat…

…e item IDs, generate empty images for entities without assets

Auto generate random item IDs and improve upgradables

Improved storefront support for Upgradable goods and upgrades

Storefront supports new V3 model

Storefront conforms to the old SDK model, before V3 was released