Remove VELO references.

A very large pull, but mostly straight-forward: filenames changed from `*velo*` to `*webmonitor*` and all instances of `velo` and `VELO` changed to `webmonitor` and `WebMonitor`.

All pages have been removed, with some moved to `/examples`. This contains a few example templates (towards #3 maybe?).

Configuration has also been moved from the main server definition script (was `velo.py`, now `webmonitor.py`) to `config.py`. I imagine this is a file we'll provide a template of, which projects can copy for their own deployments.

Will probably need to `vagrant destroy` and recreate the VM though, which is a little annoying.