disable postgres tests by default

[rweng]

Just a suggestion, but since I needed it anyway I made a pull-request out of it:

Let's give the option to enable and disable platform/database specific tests. Why? For me, it's just that I have a different connection string for postgres. We could make it possible to pass it in, however, someone else might not have postgresql installed. As long as the platform-specific tests are run on travis before merge, I think it's more intuitive (for new developers) if the tests pass right away and no extra setup is required.

Let me know what you think.

[stmichael]

Such a mechanism is already provided with the rake tasks. Executing rake spec will only run unit, integration and acceptance tests. This will give you already the desired effect. When I work on data-import I always use the rake tasks to run a test suite and don't run rspec directly. Take a look at tasks/spec.rake for more information about the tasks.

But thanks to you, I found out that db specific tests haven't been run on travis until now. That's very naughty of me 😢

[stmichael]

The travis issue has been fixed on the current master.