Removed php 5.3 support

.travis.yml

 language: php
 
 php:
-    - 5.3
     - 5.4
     - 5.5
     - 5.6

composer.json

@@ -18,7 +18,7 @@
 		}
 	],
 	"require": {
-		"php": ">=5.3.0",
+		"php": ">=5.4.0",
 		"ext-pdo": "*",
 		"hoa/math": "~0.0"
 	},