Fix config options ignored for WebSQL driver & test issues

This was a minor issue that caused the default db name and table to be called 'undefined' for the webSQL driver. 

The bigger issue is related to the tests, when I tried writing a test for the problem. A test that covered this was already present, but it was never executed because the `casper-grunt` plugin ignores arguments for test mode, so all tests are run against the `localStorage` driver. 

I'm not sure when this test issue was introduced, but I've submitted a bug to the grunt-casper repo and hopefully an update will be available soon : https://github.com/iamchrismiller/grunt-casper/issues/40

P.S:  Other tests are failing when running casper with the different drivers.