Removed hybrid core references

Author: robneu

config/grunt/clean.js

@@ -38,7 +38,6 @@ module.exports = {
 	},
 	php: {
 		src: [
-			'<%= paths.hybridCore %>',
 			'includes/vendor/'
 		]
 	},

index.js

@@ -17,7 +17,6 @@ module.exports = function() {
 			bower:        'assets/bower/',
 			composer:     'assets/composer/',
 			grunt:        'config/grunt/',
-			hybridCore:   'hybrid-core/',
 			tasks:        'config/grunt/tasks/',
 			global: {
 				config: path.join( __dirname, 'config/' ),