postgres-installer

Hi,

this is my first pull request, so please excuse if I make some mistakes.

I added a new sql-file (pgsql.sql) that should replace postgres.sql. This file has a bug, some hidden
character at the beginning.
Than I changed the installer, so that you have some if-case for mysql or pgsql.
Finally I modified the templates for bootstrap and blueprint.

I hope, all will work.

Greetings

Jochen