Automatically generate ALTER TABLE to syncronize schema on PostgreSQL
You should use Liquibase to manage your database schema changes. You can write the schema in SQL (it was all xml back in the day). It's pretty darn easy once you get the hang of it. You can then keep all schema changes in source control. Bitbucket is free and private for small groups. 

In the meantime though, you can use Liquibase to see what the differences are, and generate change scripts, in an automated fashion. 

http://www.liquibase.org/documentation/diff.html