Make all external resources `http:` to work with downloaded layouts
Remove use of custom fonts from layout examples

Closes #185
Update YUI to 3.14.1
Replace bad practice of using custom `pure-` classname

This removes the use the `pure-` classname prefix for custom classnames.
Remove commented out CSS
Organize `pure-` classnames to come after custom classnames in layouts
Change menu items in Side Menu example to not be the Pure site's
Fix misspelling in side menu example layout
Merge pull request #189 from ericf/non-pure-core-classes

Replace bad practice of using custom `pure-` classnames
Remove unneeded Grid Unit font override, it defaults to sans-serif
Merge pull request #187 from ericf/layouts-resources

Fix external resources for downloaded layout examples
committed by screwdriver build
Update express-state dependency to v1.1.0

Also using the new `{cache: true}` option to improve performance.