This does the following:
1. Add gulp tasks to deploy to Github Pages
2. Revises routing to handle hosting from a subfolder
3. Allows development environment to run from root while production can
run from subfolder
4. Add link to PSK demo in readme.md
5. Add deploy section to readme.md
6. Add detail Deploy to Github Pages recipe
Remove getUrl function and use data binding instead
With Polymer 1.2.0 we can now use compound bindings so getUrl function
is not needed.
Change Github to GitHub
Fixed linting errors
Add example for deploy to GitHub pages
use $ variable instead of require for ghPages
