Adds test for Issue #69

[markandrus]

I think this is sufficient to test for Issue #69. Creates a test model from the common.js description with no properties defined, then the beforeCreate hook initializes the name property. I tested with Postgres:

$ ORM_PROTOCOL=postgres node test/run                                
[i] Testing postgres
[i] URI: postgres://markroberts@localhost/node-orm2-test
[0:00:19 0 78/78 100.0% node test/integration/test-validators.js]

[dresende]

Can you just move the last assert to near the first one. No need to be separated :)

[dresende]

Thank you very much!

[markandrus]

Thanks, glad to help out!