Upgrade to spell-check@0.36
Upgrade to underscore-plus 1.4
Upgrade to underscore-plus 1.4.1
Upgrade to pathwatcher 1.3.2
Use path.join instead of path.resolve

This ensures the case of the path is consistent with how require resolves
paths.

Closes #2486
Add back core spec require

This was accidentally deleted in #2462
fold classes work
Beginning of decorations
Renders decoration changes.