Add test for altering new datastreams in new objects...

... Bit of additional whitespace for readability.
Trigger datastream alter on object ingest.
Merge branch '7.x' into 7.x-new-datastream-alter
Merge pull request #369 from adam-vessey/7.x-new-datastream-alter

Add test to cover datastreams added before objects are ingested, and implementation to satisfy test.