Link to Examples from Tutorials

[KevinWorkman]

The tutorial pages should link to the corresponding examples.

For example, this tutorial: http://happycoding.io/tutorials/processing/calling-functions

Should link to these examples: http://happycoding.io/examples/processing/calling-functions/

The dumbest way would be to just manually edit the markdown content of every tutorial, but better yet we could modify the tutorial layout to point to the corresponding example: either using frontmatter or by parsing the url.

Maybe do the same thing in the opposite direction and link to tutorials from examples?