Dsc 807

Hi Shaun,

This request includes parsing of date range for collection work and component works for indexing.  It also included several additional EAD fields which was missed previously.  Could you please review these changes?

Thanks,
Shuang
So now i'm just being pedantic (because date processing is notoriously fraught), but if it's a leap year Feb will have 28 days. Just tell me to rack off :-)