Added output of type pickles in .jstype files.
Fixed RefTypes.js (IntRef and Co.).
Ignore changes in the scalalib submodule.
Better Console.{out,err}.println().
Added support for separate compilation (load .jstype files).

The JSPlatform provides a specialized classpath context that
is able to load symbol information from .jstype files, in
addition to .class files.
Do not compile library/ to .class files anymore.

Since we now support full separate compilation with the
JavaScript platform, it is not needed anymore.