Update config.md

Fix case in addSourceURLs
Merge pull request #510 from despairblue/patch-1

Update config.md
Fixes #508

Callback might be undefined.
Merge pull request #511 from despairblue/patch-2

Fixes #508
Update bwc.
Use standalone packages for new, gen, logger.
Remove handlebars.
Move src/commands to src.
Fix brunch new.