Default 'postgres.managed' to 9.2.

postgres.rb

@@ -50,7 +50,7 @@
 end
 
 dep 'postgres.managed', :version do
-  version.default('9.1')
+  version.default('9.2')
   # Assume the installed version if there is one
   version.default!(shell('psql --version').val_for('psql (PostgreSQL)')[/^\d\.\d/]) if which('psql')
   requires 'set.locale'