Update package metadata
Update package metadata

Add npm commands to run tests and build the compiler itself
Also bump the minimum required node version (for the upcoming REPL)

atsepkov/RapydScript,kovidgoyal/rapydscript-ng,kovidgoyal/rapydscript-ng,kovidgoyal/RapydScript,kovidgoyal/rapydscript-ng,kovidgoyal/RapydScript,kovidgoyal/rapydscript-ng,atsepkov/RapydScript,kovidgoyal/RapydScript,atsepkov/RapydScript