Add the support of postgres as the database.
(Config the db in the build.sh file, make the DB_TYPE to 'postgres').

Replace the host with $DB_PORT, which is dependent to the database imagae's exposed port.

Replace the 'mysql' options with 'db' options, makeing the config according to the database type.

Update the guide of how to deploy gogs in docker with the scripts.

Add transfer repository

Dev

Add missing deps

fix unique

Conflicts:
	routers/user/user.go

My mistake in #50