changing postgres password to text that does not include the username

With reference to [this StackOverflow question](http://stackoverflow.com/questions/26715449/how-to-install-postgres-using-chocolatey-nuget-when-i-receive-a-password-complex) the postgres password can't be used on default windows server 2008 R2 installs (and possibly other versions) because the password contains the username
There is also a postgresql.v8 that could probably benefit from this as well.