Stick to using _this

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added entry point for html repl

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Change build file to avoid downloads, and add som.full.js target

som.full.js is just a concatinated version of the source.

Signed-off-by: Stefan Marr <git@stefan-marr.de>