added DI dependency

Author: m4tthumphrey

composer.json

@@ -23,7 +23,8 @@
 	"require": {
 		"php":                ">=5.3.2",
 		"ext-curl":           "*",
-		"kriswallsmith/buzz": ">=0.7"
+		"kriswallsmith/buzz": ">=0.7",
+		"symfony/dependency-injection": "2.3.*@dev"
 	},
 	"autoload": {
 		"psr-0": { "Gitlab\\": "lib/" }