adding convenient case creator/modifier cached data to case es
adding convenient case creator/modifier cached data to case es

for acessing via the _source field instead of doing additional GETs to couch for creator and last_modified
puttarajubr/commcare-hq,qedsoftware/commcare-hq,SEL-Columbia/commcare-hq,SEL-Columbia/commcare-hq,puttarajubr/commcare-hq,gmimano/commcaretest,SEL-Columbia/commcare-hq,dimagi/commcare-hq,puttarajubr/commcare-hq,qedsoftware/commcare-hq,gmimano/commcaretest,puttarajubr/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,qedsoftware/commcare-hq,gmimano/commcaretest