master is now using sbt 0.11 instead of 0.7.x. If not already done,
you have to install sbt 0.11. on your local machine. See
https://github.com/harrah/xsbt/wiki/Migrating-from-SBT-0.7.x-to-0.10.x
for more information.
Please note that the "jetty-run" command is now replaced by "container:start".
Regards,
Marco