Fix for sbt 0.12+ on centos with yum rpm's

Use the rpm from http://scalasbt.artifactoryonline.com/scalasbt/sbt-native-packages/org/scala-sbt/sbt/ just like debian and ubuntu instead of repo only rpm.typesafe.com

The http://rpm.typesafe.com contains only an old sbt launcher version 0.11:
''package[sbt] installing sbt-0.11.3-1 from typesafe repository''
log when I try to start 0.12.3 sbt project:
''
[vagrant@localhost vagrant]$ sbt ~run
Detected sbt version 0.12.3
Cannot find sbt launcher 0.12.3
Please download:
  From  http://typesafe.artifactoryonline.com/typesafe/ivy-releases/org.scala-tools.sbt/sbt-launch/0.12.3/sbt-launch.jar

    To  /home/vagrant/.sbt/.lib/0.12.3/sbt-launch.jar
''