Adding an AttributePolicy system

This change adds a policy system that will be used by the KmipEngine to
track and organize rules for individual KMIP attributes. Comparison
operators for the Integer primitive and ProtocolVersion struct are added
to support the AttributePolicy. Tests for all new changes are included.

kmip/core/primitives.py

@@ -231,10 +231,10 @@ class Integer(Base):
                     raise ValueError('integer value less than accepted min')
 
     def __repr__(self):
-        return "{0}(value={1})".format(type(self).__name__, repr(self.value))
+        return "{0}(value={1})".format(type(self).__name__, self.value)
 
     def __str__(self):
-        return "{0}".format(repr(self.value))
+        return str(self.value)
 
     def __eq__(self, other):
         if isinstance(other, Integer):
@@ -248,6 +248,30 @@ class Integer(Base):
         else:
             return NotImplemented
 
+    def __lt__(self, other):
+        if isinstance(other, Integer):
+            return self.value < other.value
+        else:
+            return NotImplemented
+
+    def __gt__(self, other):
+        if isinstance(other, Integer):
+            return self.value > other.value
+        else:
+            return NotImplemented
+
+    def __le__(self, other):
+        if isinstance(other, Integer):
+            return self.__eq__(other) or self.__lt__(other)
+        else:
+            return NotImplemented
+
+    def __ge__(self, other):
+        if isinstance(other, Integer):
+            return self.__eq__(other) or self.__gt__(other)
+        else:
+            return NotImplemented
+
 
 class LongInteger(Base):
     """