CSPACE-5869: Set limit of 40 media items returned in media snapshot, for...

... safety.

Please merge to master.

Log statements after sample upload reflect change to Mediaview.js, with no untoward side effects:

{code}
127.0.0.1 - - [13/May/2013:11:51:24 -0700] "GET /cspace-services/media?pgSz=40&pgNum=0&rtSbj=ffc5ca6b-a9c9-4aaa-9981&wf_deleted=false HTTP/1.1" 200 1118
0:0:0:0:0:0:0:1 - - [13/May/2013:11:51:24 -0700] "GET /collectionspace/tenant/core/cataloging/media/ffc5ca6b-a9c9-4aaa-9981?pageNum=0&pageSize=40 HTTP/1.1" 200 1080
{code}

Thanks,
Rick