Add note about required callback for custom server
Suppress warning for env-specific files

Resolves gh-872
It's 2014 now :laughing:
Update README.md
Merge pull request #874 from brunch/anyJoinTo

Suppress warning for env-specific files
Release 1.7.16
Copy default config before overriding

Resolves #878
Update some deps
Fix comment syntax
Warn when custom server doesn't callback
Remove unused modules
Correct usage instruction in CLI help
Add CLI switch to enable debug output
Release 1.7.17
Remove stable branch note in stable branch