feat(bower): added vendor-dependencies via bower

-- added scss-components
-- added bourbon
refactor(grunt): removed dist-task for sass

-- compressed css in build-process
-- path to scss and stylesheets
refactor(assets): restructure assets

-- added assets-folder for fonts, stylesheets and scss
-- font-icons in "icons"-folder
-- structuring scss-files to _modules, _base, _layouts and _states
-- including font-face and icons via scss-components
-- renaming files for categorizing (modules, states and layouts)