Move parsing of GID2 to generic Card class

Change-Id: I3fe4b08c888a39cda7e7fce7a467f17908bdc3ad
diff --git a/pySim/cards.py b/pySim/cards.py
index 61a3707..495d3ee 100644
--- a/pySim/cards.py
+++ b/pySim/cards.py
@@ -152,6 +152,13 @@
 		else:
 			return (None, sw)
 
+	def read_gid2(self):
+		(res, sw) = self._scc.read_binary(EF['GID2'])
+		if sw == '9000':
+			return (res, sw)
+		else:
+			return (None, sw)
+
 	# Read the (full) AID for either ISIM or USIM application
 	def read_aid(self, isim = False):