Add Linux build instructions for just generating a binary?
I'm trying to build the compiler to experiment with the sources. I was following the instructions on http://doc.kaitai.io/developers.html, which work well for e.g. building a debian package; the resulting .deb file is installable & works well. However, there doesn't seem to be a description of how to just get something runnable with the least amount of packaging (as in: the way one would actually write code for it).

I found that after running `compilerJVM/debian:packageBin`,

 `.../kaitai_struct/compiler/jvm/target/scala-2.12/kaitai-struct-compiler_2.12-0.9-SNAPSHOT.jar0.9-SNAPSHOT/usr/share/kaitai-struct-compiler/bin/kaitai-struct-compiler`

does work & is being updated if I rerun the target.

However, e.g. going for `compilerJVM/universal:packageBin` results in a `.../kaitai_struct/compiler/jvm/target/scala-2.12/kaitai-struct-compiler_2.12-0.9-SNAPSHOT.jar` file that throws
   
    Exception in thread "main" java.lang.NoClassDefFoundError: scala/collection/Seq

(... on OpenJDK 8, with Scala installed, at least in theory), while the launcher script `./jvm/target/universal/scripts/scripts/kaitai-struct-compiler` (the only one with this name) fails with

    Error: Could not find or load main class io.kaitai.struct.JavaMain


To a person more familiar with Scala & SBT, it might be obvious why all these are happening; however, as someone with a decent amount of generic Linux / Java knowledge but no Scala specifics, I'd definitely find it nice if you could add some docs for this use case (... "just give me a working binary / how does your developer workflow look like") as well?