Remove Link headers from bucket and key lists

While webmachine/mochiweb only accepts headers up to 8KB in size, it has no problem producing huge headers. However, many clients cannot handle large headers. Since the same information is produced in the body of these requests anyway, we have no need to produce Link headers as well. If we want to really use HATEOAS, other things need to be reconsidered. Since we don't really have HATEOAS, let's not pretend anymore.

This also adds some ignores for EQC artifacts.