Target v1.3.1
Utility to fetch a token from a layergroup config

It's in its infancy, still need to edit the script to use against
remote service or non-standard local deploys
Run silently, prepare for using against windshaft direct
Fix deadlock on layergroup post

Required upgrading windshaft to 0.12.5.
Took the chance to also upgrade redis dependency to latest stable.
Only return token by default and full response on request (-v)
Drop unused cluster support
Fix database authentication with multi-table layergroups
Fix SQL bug in testcase
Add tile and grid fetching checks at layergroup creation time

Basically requires windshaft 0.12.6, which implements this
Fix SQL error reporting to NOT split on newline
Set default layergroup ttl locally
specify units for rendererConfig.cache_ttl
Raise windshaft dependency importing following fixes:

 - support for CartoCSS attachments (#layer0::label)
 - only check layergroup validity once
 - use higher zoom level for checking layergroup validity
Add support for listing all map styles that belong to a user

Also report user database name, as a facility
Be more verbose about curl errors
Only make curl verbose when -v is passed to commandline
Add support for specifying tiler url
Do not consider broken layergroup configs as good on second look

The fix is really in Windshaft, this commit simply requires a
newer version of it.
Merge branch 'release/staging'