PostgreSQL: schema diff/patch tool
Sorry to resurrect an old question

Recently I have been using the 0xDBE DataGrip Database management tool by JetBrains. 

It supports multiple database engines, in the excellent Jetbrains IDE, and a key feature I have found useful is the ability to diff 2 tables (DEV and PROD). 

Below is a screenshot of the diff in action (in this case there is only one column difference). The screenshot is the result of the "Merge Right" button at the top, generating the SQL required to bring the right table up to scratch.



Hope this new tool helps.