Switch to the correct Scala IDE profile for skipping flaky tests.
Merge pull request #19 from dragos/ide/switch-to-retry-flaky-tests

Switch to the correct Scala IDE profile for skipping flaky tests.
Don't run (nonexistent) partest tests (crashes sbt)

Sbt crash: https://github.com/sbt/sbt/commit/18bc8423b5#commitcomment-3901872
Log: https://scala-webapps.epfl.ch/jenkins/view/pr-validators/job/pr-scala-integrate-partest/892/console
Make `maven` run in batch mode (remove hundreds of lines of download progress).
Correctly retrieve `sbt.version` from pom.xml.

This should fix failures like [1508](https://scala-webapps.epfl.ch/jenkins/view/pr-validators/job/pr-scala-integrate-ide/1508/consoleFull)