Fixes #584
docker_version can now be left blank to automatically download and
install the latest available. Docker client will not be installed if it
is already present in the build container.
Return ErrInternalServer when docker server return 500 code
added docs to README
Add plain text fallback messages for slack plugin
prevent panic when replaying on closed channel
Wall feed
Add feed route
reverse sorting private params when injecting
updated to use new documentation link
Testing: Make MySQL DB creating more error resilient
Use join instead of subquery
Removed commit List User limit