Documentation's autorefresh fixed

- own task for documentation
- ’watch’ task watches for changes in style sheets and run
documentation task when needed
Categorized documentation created
comments added

Conflicts:
	docs/atoms-animations.html
	docs/atoms-backgrounds.html
	docs/atoms-borders.html
	docs/atoms-layout.html
	docs/atoms-lists.html
	docs/atoms-spacers.html
	docs/atoms-typography.html
	docs/components-components.html
	docs/core.html
	docs/index.html
	docs/main.html
	docs/variables.html
	gulpfile.js
Merged gulpfile.js