Added a Collaborate button.
Merge branch 'master' of https://github.com/nsthorat/rtc-pencilcode-site

Conflicts:
	site/top/src/editor.html
Collaborator button now saves owner to collaborator file.
Merge branch 'master' of https://github.com/nsthorat/rtc-pencilcode-site
Collaborator buttons should now work.
Merge branch 'master' of https://github.com/nsthorat/rtc-pencilcode-site