Implement block nesting functionality: Columns block.
Merge branch 'feature-nested-blocks'
Revert changes made to components paths
Fix block delete controls styling
Fix scripts to pass the tests
Fix columns width calculation
Fix validation issue: nested blocks should not be saved from outer context
Fix destruction issues: remove only top-level blocks, unbind form submit (to be able rebind it later)
Fix columns reducing issue
Merge commit '3aa0df38a72f9fccb84f3cc7126490b6d80c22d8'

Conflicts:
	Gruntfile.js
	package.json
	sir-trevor.js
	sir-trevor.min.js
	src/block.js
	src/locales.js