Style cleanup on readme.
Describe LWRP.
Add devpi_server LWRP.
Add lwrp-test cookbook.

You know... for testing the LWRP code.
Add BATS tests for devpi_server LWRP.
Ensure that specific devpi versions can be installed.

There was some associated breakage since the devpi user was being
modified if it already existed.
Ensure that external data directories are supported.
Address FC021 in providers/server.rb.
Address a few style complaints.
Add nginx support.
Implement devpi_server delete action.
Disable default nginx site.
Add devpi_nginx_site LWRP.
Use devpi_nginx_site LWRP in devpi_server LWRP.
Use devpi_nginx_site in nginx recipe.
Reload/start nginx in the nginx recipe.

For some reason, nginx does not reliably start on CentOS so I added a
:start notification.  This seems to be reliable now.
Remove log directory management.
Remove unused nginx template.
Try to set the appropriate host name in devpi_nginx_site.

This is slightly more difficult than it should be.  See bitbucket
PR#186 (https://bitbucket.org/hpk42/devpi/pull-request/186/) for
details.
Adjust vagrant machine definition for changes.