Remove Bootstrap and Font Awesome as embedded stylesheets

These libraries will still be bundled with Cilantro, however removing
them as embedded files enables using alternate hosting solutions.

Projects must include the following <link> tags before the the Cilantro
stylesheet is included:

```html
<link rel="stylesheet" href="/path/to/bootstrap.css">
<link rel="stylesheet" href="/path/to/bootstrap-responsive.css">
<link rel="stylesheet" href="/path/to/font-awesome.css">
```

It is recommended to use a CDN for production.

Fix #492

Signed-off-by: Byron Ruth <b@devel.io>