Show fiat options from api.bitcoinvenezuela.com

Adding the options to be able to select BitcoinVenezuela.com fiat exchange rates in the Preferences. Certificate validation has been fixed.

lib/currencies.json

@@ -341,6 +341,12 @@
     "Bitcointoyou": [
         "BRL"
     ],
+    "BitcoinVenezuela": [
+        "ARS",
+        "EUR",
+        "USD",
+        "VEF"
+    ],    
     "Bitmarket": [
         "PLN"
     ],
@@ -814,4 +820,4 @@
         "USD"
     ],
     "itBit": []
-}
+}