Update README.md
Fixed scdl-usl profile format.
Added detailed error information in poll_profiles.
Merge branch 'master' of github.com:dpla/ingestion
Updated list_sets to handle various setDescription structures.

-Also updated Minnesota endpoint URI
KDL added

-Added kentucky profile
-Removed dpla-list-records requirement for set
-Added length check to content returned from ListSets. If lenght
 is less 2 or less, sets the profile name as the set name
-Added kentucky_identify_object module
-Removed error on empty "rights" from *_identify_object modules
-Added base class identify_object in akara configuration to hold
 status constants
Merge branch 'master' into artstor