feat(bower): added vendor-dependencies via bower

-- added scss-components
-- added bourbon
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)
fix(grunt): make scss:dist and scss:dev share one filename

This way we can change to uncompressed version
without changing the template