added server metadata operations for Fog::Compute::RackspaceV2
refactored Fog::Compute::RackspaceV2 metadata to take collection as a parameter rather than using it as part of the method name.
fixing broken metadata tests
changed metadata implementation for Fog::Compute::RackspaceV2::Server and Fog::Compute::RackspaceV2::Image
changing variable names to make code clearer
fixing broken tests
Merge branch 'master' of github.com:fog/fog into server_metadata
added better acceptance criteria to server/image metadata tests; added metadata to ignored_attributes to address bug
fixing merge issues with master
fixing typo
fixing broken tests
Merge pull request #1452 from rackspace/server_metadata

Rackspace Server/Image metadata operations