Remove default view but keep `view.json`.
Adapt `view.json` path.
Remove old theme code and use theme dependency.
Remove old assets dump.
Merge theme abstractions branch.

The `view` directory and all templating logic is removed from
SassDoc, and this is now deletated to `sassdoc-theme-default`.

The only interface needed for a theme is the one described here
<https://github.com/SassDoc/sassdoc/issues/47#issuecomment-49507761>.

Conflicts:
	view/assets/css/main.css
	view/assets/js/main.js
	view/scss/base/_base.scss
	view/scss/partials/_footer.scss
	view/scss/partials/_header.scss
	view/scss/partials/_item.scss
	view/scss/partials/_main.scss
	view/scss/partials/_sidebar.scss
	view/scss/utils/_functions.scss
	view/templates/includes/annotations/requires.html.swig
	view/templates/includes/items/item.html.swig
	view/templates/includes/items/variable.html.swig
	view/templates/includes/partials/sidebar.html.swig