added network and disk driver options, also a source comment on the kickstart file in the docs (I can't find the original source).
Merge remote-tracking branch 'upstream/master'
Merge pull request #383 from marcw/readme-format

Add make format information in the README.
Update README
removed a few stray 'VirtualBox' term uses in comments and docs.
Merge remote-tracking branch 'upstream/master'
changed error string referring to 'ova' and 'ovf' to refer to 'qcow2' and 'img' as the former were stray leftovers from the virtualbox code used as a basis for this plugin.
builder/amazon: Re-ordered steps for AMI region copying so tags and
launch permissions are also applied to copied AMIs
Also deregister AMI if it was copied to other regions
builder/digitalocean: retry on any pending event errors

/cc @pearkes - I hate this thing.
Update CHANGELOG
builder/digitalocean: looser pending event string matching.

Most APIs return "has a pending event" but power off seems to return
"already a pending event". WTF. Also, just wtf at the DigitalOcean API.
I can't wait until they change their english and this breaks. Because
it is definitely going to happen, and it's going to be such a fun time.
builder/digitalocean: retry power off a number of times

See comment.
builder/digitalocean: break loop if we reach off state

Otherwise we get stuck in a long loop. Whoops.
builder/digitalocean: actually, we want to try hard on shutdown
builder/digitalocean: properly cleanup goroutines for status checking
builder/digitalocean: proper timeouts so poweroff retries
builder/digitalocean: give up on graceful shutdown more quickly
builder/digitalocean: get compilation working again
builder/digitalocean: retry pending events a lot more