Use a meaningful error message if Vlad can't be loaded by Rake.
Remove vlad-extras for now, since it's causing deployment to fail when it tries to use its deprecated symlink task.
Fix deployment failures due to vlad assuming we're deploying a Rails project.
Add some commented-out code to ensure that the deployed files have the right permissions.

This code can be made live when the server is set up to allow the vlad
user to change file and directory ownership. Until then, it'll just
cause deployment to fail with "operation not permitted".
Vlad won't try to ensure that the web server is running after deploying, for now.

The vlad user on the server doesn't have privileges required to start or
stop the nginx or PHP-FPM services, so the instructions to ensure the
server is running will only fail. Once vlad has sufficient privileges,
this step can be re-enabled in the deployment task.
Merge branch 'master' of github.com:Slixbits/slixbits.github.io