added support for postgres9.4 which is now available from amazon

cloud/amazon/rds_param_group.py

@@ -47,7 +47,7 @@ options:
     required: false
     default: null
     aliases: []
-    choices: [ 'mysql5.1', 'mysql5.5', 'mysql5.6', 'oracle-ee-11.2', 'oracle-se-11.2', 'oracle-se1-11.2', 'postgres9.3', 'sqlserver-ee-10.5', 'sqlserver-ee-11.0', 'sqlserver-ex-10.5', 'sqlserver-ex-11.0', 'sqlserver-se-10.5', 'sqlserver-se-11.0', 'sqlserver-web-10.5', 'sqlserver-web-11.0']
+    choices: [ 'mysql5.1', 'mysql5.5', 'mysql5.6', 'oracle-ee-11.2', 'oracle-se-11.2', 'oracle-se1-11.2', 'postgres9.3', 'postgres9.4', 'sqlserver-ee-10.5', 'sqlserver-ee-11.0', 'sqlserver-ex-10.5', 'sqlserver-ex-11.0', 'sqlserver-se-10.5', 'sqlserver-se-11.0', 'sqlserver-web-10.5', 'sqlserver-web-11.0']
   immediate:
     description:
       - Whether to apply the changes immediately, or after the next reboot of any associated instances.
@@ -60,7 +60,7 @@ options:
     required: false
     default: null
     aliases: []
-    choices: [ 'mysql5.1', 'mysql5.5', 'mysql5.6', 'oracle-ee-11.2', 'oracle-se-11.2', 'oracle-se1-11.2', 'postgres9.3', 'sqlserver-ee-10.5', 'sqlserver-ee-11.0', 'sqlserver-ex-10.5', 'sqlserver-ex-11.0', 'sqlserver-se-10.5', 'sqlserver-se-11.0', 'sqlserver-web-10.5', 'sqlserver-web-11.0']
+    choices: [ 'mysql5.1', 'mysql5.5', 'mysql5.6', 'oracle-ee-11.2', 'oracle-se-11.2', 'oracle-se1-11.2', 'postgres9.3', 'postgres9.4', 'sqlserver-ee-10.5', 'sqlserver-ee-11.0', 'sqlserver-ex-10.5', 'sqlserver-ex-11.0', 'sqlserver-se-10.5', 'sqlserver-se-11.0', 'sqlserver-web-10.5', 'sqlserver-web-11.0']
   region:
     description:
       - The AWS region to use. If not specified then the value of the AWS_REGION or EC2_REGION environment variable, if any, is used.
@@ -98,6 +98,7 @@ VALID_ENGINES = [
     'oracle-se-11.2',
     'oracle-se1-11.2',
     'postgres9.3',
+    'postgres9.4',
     'sqlserver-ee-10.5',
     'sqlserver-ee-11.0',
     'sqlserver-ex-10.5',