howto/hacking: use “dcs” postgres user for every database
service files: add After=postgresql.service

Otherwise, the service might not come back up when a VM gets rebooted.
search.go: gofmt (only changes import order)
index/write: make writing goroutine-safe

This was useful for an evaluation I did where the index was created in
parallel.
howto/update-the-index: add database creation steps
howto/update-the-index: add GPG setup
add nginx example configuration file
add rackspace API and dcs-rs-cleanup

Note that there are still hard-coded paths to SSH keys in the code. In
case you are actually interested in using this for setting up your own
DCS instance on rackspace, let me know and we can make it work. Until
then, this is mostly for transparency and in case the code is useful for
anyone.