Change to sonatype repo

Updated for new locations of dependencies:

  sbt-scalajs now at https://bintray.com/inthenow/sbt-plugins/sbt-scalajs/view. 
  scalatest-jasmine now at https://oss.sonatype.org/content/repositories/releases/com/github/inthenow/

Both these repo's are "standard" and hence should be accessible by all - @hannibalhh would you be able to confirm that this fixes your issue, please?