adding integration test to #120

Author: erosb

tests/src/test/resources/org/everit/json/schema/issues/issue120/schema.json

@@ -0,0 +1,8 @@
+{
+	"type": "object",
+	"properties": {
+		"UserName": {
+		"type": "string"
+		}
+	}
+}

tests/src/test/resources/org/everit/json/schema/issues/issue120/subject-invalid.json

@@ -0,0 +1,3 @@
+{
+"UserName": 1234567890123456789012345
+}