Merge pull request #94 from cjcolvar/master

Modify or remove tests that check for DC datastreams; deprecate Datastreams#dc in favor of Datastreams#datastreams["DC"]
Closes #84
Merge pull request #95 from dchandekstark/issue-84

Closes #84
wrap property accessors in multi -> single valued wrappers
add support for rubydora's #uri method (for fcrepo4 compatbility)
remove unnecessary test
remove checks for fedora default values
use our test namespace rather than minting a new one in base_spec
try to use a createdDate accessor on @inner_object if it is available
Remove unnecessary environment task