Add "externals" option to fable-splitter
Add "externals" option to fable-splitter

ncave/Fable,ncave/Fable,fable-compiler/Fable,fable-compiler/Fable,fable-compiler/Fable,inosik/Fable,ncave/Fable,fable-compiler/Fable,fable-compiler/Fable,ncave/Fable,ncave/Fable,inosik/Fable,fable-compiler/Fable,ncave/Fable,fable-compiler/Fable,ncave/Fable