Fix Bug 876527 - Don't overwrite existing make fields on an update, concatenate tag arrays, and determine which date field to timestamp.
Fix Bug 876527 - Don't overwrite existing make fields on an update, concatenate tag arrays, and determine which date field to timestamp.

mozilla/MakeAPI,cadecairos/MakeAPI,cadecairos/MakeAPI,jbuck/MakeAPI,mozilla/MakeAPI