Update WordPress to 3.9.1
 - starting from a clean `roots/bedrock`
Merge branch 'master' of https://github.com/mattwellss/bedrock into update-to-3-9-1

Conflicts:
	.gitignore
	CHANGELOG.md
	README.md
	composer.json
	composer.lock
	config/application.php
Merge pull request #1 from mattwellss/update-to-3-9-1

Update to 3.9.1