Include missing docs: human-view and human-model

__Issue__: human-model and human-view docs are missing from `index.html`.

__Solution__: Pull request includes documentation.
* `index.html`: Includes human-model and human-view documentation.
* `index.jade`: Updates the documentation links to the official repository READMEs. Contributors can now run `$ node build.js` without needing to locally clone the human-model and human-view repositories.



Note: The most recent [changes](https://github.com/HenrikJoreteg/docs.humanjavascript.com/commit/55b89febb47e9cbf6af0f8f8d6b58590c61491f5) made to `index.html` are not reflected within `index.jade`. Respecting these changes, the only HTML acquired from `$ node build.js` are the generated docs, not its surrounding HTML.