Feature request: bulk_delete

[Adrian-at-CrimsonAzure]

The title basically says it all. It would be convenient to be able to pass a list of ORM collection records and delete them using the underlying delete_many in Python-Arango.

[overbost]

i would like to have this features.
In my case i would like to delete relations of a collection

[overbost]

I made bulk_delete, now is merged in master #122
Is not based on delete_many, i made a simple cycle wrapper to delete method.
Of course is not an efficient solution but it works. I will make it better in future.
Mark as closed if you are satisfied.