Remove OpenQA repo. It closed, returns non-POMs, and breaks the build.
Build against Scala 2.10.4-RC3.

Motivation: https://groups.google.com/forum/#!topic/scalate/MTMOADeDFSI

Scala 2.10.3 failed to load Axis in scalate-tool.  Fixed by
https://issues.scala-lang.org/browse/SI-7439.