Update mkdocs to the new yaml syntax.
Update mkdocs to the new yaml syntax.

The yaml syntax changes with mkdocs version 0.13 :
   http://www.mkdocs.org/about/release-notes/#version-0130-2015-05-26

The new syntax is described here :
   http://www.mkdocs.org/user-guide/writing-your-docs/#configure-pages-and-navigation

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