[core] exclude :headers from symbolization for real this time; added better tests; Thanks @burns!
Merge pull request #2067 from rackspace/header_fix2

[core] exclude :headers from symbolization for real this time
[openstack|compute] update flavor tests

- Update mocks and reorder tests so both live and mocked tests pass.
- Ensure #remove_flavor_access sends `tenant_id` as a String.
  If sent as an Integer, the server will return 500.
  (#add_flavor_access works either way)
[openstack|storage] Added temporary signed URL support
Merge pull request #2070 from burns/openstack_compute_flavor_tests

[openstack|compute] update flavor tests
Merge pull request #2071 from snoopie/openstack_signed_url

[openstack|storage] Added temporary signed URL support
[rackspace] added transaction id to monitoring exceptions; passing service into slurp for compute, databases, dns and load balancers
[aws|iam] Make mock EntityAlreadyExists message match reality.
[openstack|image] strip unused headers in #update_image

* update tests to pass both live and mocked
Merge pull request #2073 from burns/openstack_image_tests

[openstack|image] strip unused headers in #update_image
Merge pull request #2072 from rackspace/trans_id2

[rackspace] added transaction id to monitoring exceptions