Merge pull request #1360 from dprince/openstack_remove_server_requests_format

OpenStack: Drop unused server_format hash.
Merge pull request #1339 from frodenas/fix-regions

[openstack] Show an error message when there aren't any endpoints available for a region
add failing test and update Mock list_users to filter based on tenant_id
update tenant.rb to pass the test, by passing correct parameter
Merge pull request #1361 from dprince/auth_improvements

OpenStack: Auth improvements
added create_image and delete_image to Compute::RackspaceV2 Fixes #1351
Merge branch 'master' of github.com:fog/fog into create_image
[rackspace|dns] creating a record now uses specified ttl
Merge pull request #1364 from helle/rackspace_dns_add_records_ttl

[rackspace|dns] creating a record now uses specified ttl
Merge pull request #1366 from CobyR/master

fix for tenant.users returning all users
added a mock for Compute::RackspaceV2 delete_image; Compute::RackspaceV2 has not implemented mocking support however
Merge branch 'master' of github.com:fog/fog into create_image
Updated Fog.wait_for to throw a timeout exception instead of returning false #1368
updating wait_for timeout message per conversation with @geemus
Merge pull request #1369 from rackspace/wait_for

Fog.wait_for should raise timeout exception instead of returning false
Modified Fog::Compute::RackspaceV2 destroy image test from test setup
Updated Fog::Rackspace::Errors::Service error to include the HTTP response code to aid in debugging
use old multijson methods
Merge pull request #1374 from rackspace/error_info

Added Http response code to Fog::Rackspace::Errors::Service
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