Remove ../'s from bower_components paths

This is my proposition for the `bower_components` mess. Instead of only fixing that, I went further and removed `bower_components` from URLs completely, because to me they are kind of verbose and potential issues with name conflicts seem unlikely enough.

So instead of:

```html
<script src="../bower_components/modernizr/modernizr.js"></script>
```

we would have:

```html
<script src="modernizr/modernizr.js"></script>
```

Same goes for Sass. No more `../../../../` sillyness.

Fixes #150.
I would actually want this:

```js
ignorePath: /^(\.\.\/)*\.\./
```

This would always end up with the absolute `/bower_components` path, regardless of the file structure. A relative `bower_components` path wouldn't work in `about/index.html`. (I know other asset paths wouldn't work also, but we can at least offer some help.) This would be inconsistent, but nicer to use. And maybe trying to achieve inconsistency here is stupid, because `@import`ing works differently than serving assets.

Thoughts? @eddiemonge?

Also, sorry for bothering you with this crap. It will be over soon.