Prevent some frequently occurring problems
* Ensure version number is between quotes
* Ensure git and SSH are installed for the deployment step
* Focus extra attention on the wercker.yml verification site
General revisions to (hopefully) make the documentation
easier to understand and more comprehensive.
Revise "Strange EOF error" troubleshooting page to say that
a fix is in place for the upcoming Hugo v0.13.
Also add more external links, and cute icons from Font Awesome.