Garbage collector issue when the ScalaJS plugin is enabled

[nrinaudo]

This is a really odd one: I can reproduce an OOM (gc overhead) exception systematically when running tut on my projects, on my local computer, if the scala.js plugin is enabled.

I don't know that this is an issue with tut - it probably isn't - but, in case somebody encounters it: the workaround is to use a non-default gc configuration. I basically copied cat's .jvmopts file, and the problem went away.