Fix multi-project Scala version
Fix multi-project Scala version

sbt was trying to build a 2.10 app, despite how I specified it to be
2.11.4.

Further, the build was failing for reasons I don't understand.

I looked up how to specify a scalaVersion in a multi-project build, and
found
http://www.scala-sbt.org/0.12.2/docs/Getting-Started/Multi-Project.html#sharing-settings
so did that, and I am now able to build!

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