added GS_AUTO_CREATE_STORAGE_CLASS, GS_AUTO_CREATE_LOCATION settings

[f1aky]

I could not fix the tests for gcloud, can someone else will do it

[sww314]

The storage class should not be responsible for creating the buckets. It makes the most common case retrieving a file more complicated and adds additional network trips to Google. Instead, create your bucket outside the storage class. You need dynamic bucket creation a more explict approach would work better. It also causes permissions problems as the SerivceAccount needs more permissions than it should (#412).

[jschneier]

I am going to add this concept as a recipe to the docs. This functionality has negative performance impacts on the far more common use cases.