enable Zombiefication of JS-Functions

you can now redirect “this” in a JS function by binding it to another
sprite using the OF block
Fix #563 (Paste into Chrome), thanks, @Muon, for the hint!
update octokit, fix a first-commit bug
prepare for team support
beautify xml
Merge branch 'xml_beautifier' into github_backend
support merging [WIP]