[rackspace|storage] added support for container metadata; added directory tests
Merge branch 'master' of github.com:fog/fog into dir_metadata
[rackspace|storage] Cloud Files will not process a header without a value so I added a stand in value for nil
Merge branch 'master' of github.com:fog/fog into dir_metadata
[rackspace|storage] added delete method to metadata
Merge branch 'master' of github.com:fog/fog into dir_metadata
[rackspace|compute] added test for put_container with an optional parameter
[rackspace|storage] updated directory to lazy load metadata when necessary
[rackspace|storage] added tests for metadata class; fixed bug with method missing
Merge branch 'master' of github.com:fog/fog into dir_metadata
Merge pull request #1563 from rackspace/dir_metadata

[Rackspace|Storage] Added support for container metadata