Added TOC, Anchor links

@jboner Hi Jonas. I've added a TOC, and the inline anchor links. The TOC is formatted across two columns on wider screens, it then becomes one column on smaller screens (see screenshots)

![manifesto-toc](https://cloud.githubusercontent.com/assets/1418129/5035621/8802fca4-6b2d-11e4-8a6a-5ee0b8e75169.png)
![manifesto-toc-mobile](https://cloud.githubusercontent.com/assets/1418129/5035623/8dbcfff0-6b2d-11e4-8cd0-0cdb76596b60.png)