Fix #297: Add flag to hack away lingering calls to Predef.classOf

This fixes a bug which would have been introduced with the next
revision. The commit merely exists for spearation of concerns.
Configure sbt to pull scalalib depencencies for cross compile
Generalize scalaVersion in partest suite
Add 2.11.0-M8 to partested versions
Add 2.10.3 and 2.11.0-M8 to travis build
Merge pull request #300 from gzm0/full-cross-compile

Full cross compile support for build-scripts and partest
Merge branch 'master', remote-tracking branch 'scala-js/master'