* origin/master: (65 commits)
Move vm code into sandbox
Update docs
Look for config in .probot.js
Remove URL stuff for now
Use handlebars in comment templates
Remove unnecessary semicolon
Extract Sanbox class, remove workflows.push
Move evaluator to its own file
Remove unused modules
More style fixes
Fix style
Reimplement reactions
Implement unlock
Implement locking
Implement open
Implement unlabel
Implement unassign
Implement issue assignment
Implement comment test
Move label tests into plugin
...