Add breadcrumb navigation for large documents

[NateWr]

In large documents it is sometimes difficult to know where you are in the document right now. It would be nice if documents included breadcrumb navigation to quickly determine where you are in the document and jump back to previous sections.

[kshuttle]

Adding that it would be great to have the title of the documentation appear on every page, as well. Once you are inside a piece of documentation you are not able to see the title - just the name of the section you are in.

[NateWr]

@kshuttle just cross-referencing with this issue, #362, which has some screenshots from other sites. The first one (Ubuntu) offers a navigation structure which would help us show more info about where the user is in the system -- not just the title, but also a section/category of the docs.