use sites-enabled as intended

correct file permissions (the files do not need to be executable)
name the vm after the folder we are in
make vagrant setup configurable

Make it possible to modify the vm config without editing this tracked
file.

Change the name of the vm (and the hostname of it) to match the name of
the containing folder. need a dev and a staging box? just clone this
repo into a dev and a staging folder and the boxes will be named
appropriately.

Make it possible to prevent the interactive "what interface should the
network bridge to"

Also make it possible to modify the cpu and memory requirements,
depending on the machine/usage 4 cores and 2GB of ram may be
insufficient or leave the host machine susceptible to OOM