Develop

### Refactoring
-- New structure for scss-files
-- removing compass (use it only if you need it)
-- Grid: instead negative margin-left, margin-right for pull-classes
-- Renaming _icons.scss to match.scss

### Features
-- Mixins for...
     -- ... animations
     -- ... appearance
     -- ... transforms
     -- ... transitions
     -- ... box-sizing
     -- ... list-reset 

### Fixes
-- SVG-Mixin: complete url as a string
-- Font-Face-Mixin: complete url as a string

### Documentation
-- update documentation
-- removed tests
-- own website for documentation (scss-components.com)