add missing bit definition for NG-RAN in xAcT

when encoding the AcT value bit 11 is correctly set
when NG-RAN is present in the string representation,
however the decoding of bit 11 was missing.
Adds tests for the decoder as well.

Change-Id: I910df28c4c59ec94cce9603377786325f6d8c1a3
diff --git a/tests/test_utils.py b/tests/test_utils.py
index ed22eff..ae23461 100755
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -80,6 +80,9 @@
 	def testDecAct_onlyEUtran(self):
 		self.assertEqual(utils.dec_act("4000"), ["E-UTRAN"])
 
+	def testDecAct_onlyNgRan(self):
+		self.assertEqual(utils.dec_act("0800"), ["NG-RAN"])
+
 	def testDecAct_onlyGsm(self):
 		self.assertEqual(utils.dec_act("0080"), ["GSM"])
 
@@ -93,7 +96,7 @@
 		self.assertEqual(utils.dec_act("0010"), ["cdma2000 1xRTT"])
 
 	def testDecAct_allSet(self):
-		self.assertEqual(utils.dec_act("ffff"), ["UTRAN", "E-UTRAN WB-S1", "E-UTRAN NB-S1", "GSM", "GSM COMPACT", "cdma2000 HRPD", "cdma2000 1xRTT"])
+		self.assertEqual(utils.dec_act("ffff"), ["UTRAN", "E-UTRAN WB-S1", "E-UTRAN NB-S1", "NG-RAN", "GSM", "GSM COMPACT", "cdma2000 HRPD", "cdma2000 1xRTT"])
 
 	def testDecxPlmn_w_act(self):
 		expected = {'mcc': '295', 'mnc': '10', 'act': ["UTRAN"]}