(Popen): New name for class popen. All references updated.

pcl_expect/popen.py

@@ -3,14 +3,14 @@ import os
 import pcl_expect
 
 __all__ = [
-    "popen",
+    "Popen",
     ]
 
-class popen(pcl_expect.expectable):
+class Popen(pcl_expect.Expectable):
     def __init__(self, cmd):
         self.__cmd = os.popen(cmd, "r")
-        pcl_expect.expectable.__init__(self, self.__cmd.fileno())
+        pcl_expect.Expectable.__init__(self, self.__cmd.fileno())
 
     def close(self):
-        pcl_expect.expectable.close(self)
+        pcl_expect.Expectable.close(self)
         return self.__cmd.close()