* Start docker-sync and use the local host volumes by default
* Make the devstack workspace configurable, make travis use /tmp
* Remove redundant env vars, set -d on make devstack.up
* Add sleep to travis.yml
* Set a default value for DEVSTACK_WORKSPACE, and export it to all subshells in Make
* Rename devstack prefix to dev, add comment to makefile target
* Edits to the README to encourage setting up docker-sync before getting
started. Also update references to make targets.