use pip not easy_install

lib/wallet.py

@@ -23,13 +23,13 @@ try:
     import ecdsa  
     from ecdsa.util import string_to_number, number_to_string
 except:
-    print "python-ecdsa does not seem to be installed. Try 'sudo easy_install ecdsa'"
+    print "python-ecdsa does not seem to be installed. Try 'sudo pip install ecdsa'"
     sys.exit(1)
 
 try:
     import aes
 except:
-    print "AES does not seem to be installed. Try 'sudo easy_install slowaes'"
+    print "AES does not seem to be installed. Try 'sudo pip install slowaes'"
     sys.exit(1)