add "inet" type for pg

Index: lib/sqlalchemy/databases/postgres.py
===================================================================
--- lib/sqlalchemy/databases/postgres.py        (revision 2199)
+++ lib/sqlalchemy/databases/postgres.py        (working copy)
@@ -32,6 +32,10 @@
     except:
         psycopg = None

+class Inet(sqltypes.TypeEngine):
+    def get_col_spec(self):
+        return "INET"
+
 class PGNumeric(sqltypes.Numeric):
     def get_col_spec(self):
         if not self.precision:
@@ -161,6 +165,7 @@
     'numeric' : PGNumeric,
     'float' : PGFloat,
     'real' : PGFloat,
+    'inet': Inet,
     'double precision' : PGFloat,
     'timestamp' : PG2DateTime,
     'timestamp with time zone' : PG2DateTime,
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