updated tests to use Scala 2.10.0
updated default zinc version to 0.2.1
first cut of sonar-runner plugin
necessary change for updating to zinc 0.2.1
polishing
fixed setting "target" option for scalac Ant task depending on Scala version (fixes GRADLE-2662)

- was caught by integ tests when updating them to use Scala 2.10.0
increase max memory for scala compilation integ test