remove mocha mocking.
silence deprecations from methods that are themselves deprecated; silence deprecations from testing deprecated methods directly.
add deprecations to MetadataDatastreamHelper
make sure ng_xml_changed? doesn't spill over across #save
lazy-load rdf data and track rdf dirty state like nokogiri ds
bump rubydora dependency to ~>1.0
bump to AF 5.2.0
ok, i give up trying to understand this spec.
short-circuit graph/ng_xml_changed? for new objects.. make sure empty content isn't counted as changed if it's a new object.
Require om to be ~> 1.8.0
NOM NOM NOM
add OmDatastream (currently just an alias for NokogiriDatastream).
Update Gemfile
 make sure fixing up @content doesn't break saving content
bump to 5.2.1
rollback #content changes.
fix up some specs, and kill some bad ones.
require rubydora ~> 1.2
update NokogiriDatastream#content to always be the serialized ng_xml
wrap saving a datastream in a before filter, preventing empty content from hitting fedora.