Abstract wp search-replace to wp-cli/search-replace-command

Author: danielbachhuber

composer.json

@@ -36,7 +36,8 @@
 		"wp-cli/db-command": "^1.0",
 		"wp-cli/media-command": "^1.0",
 		"wp-cli/export-command": "^1.0",
-		"wp-cli/package-command": "^1.0"
+		"wp-cli/package-command": "^1.0",
+		"wp-cli/search-replace-command": "^1.0"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "3.7.*",