internet archive ids downloader
Merge branch 'develop' into internet_archive
fix IA mapping for multi-valued fields
IA ids downloader formatting re-factoring
added multi-threaded document downloader for Internet Archive
added ported Counter class for python 2.6 compatibility (IA profile)
added clemson sub resource for IA profile
Merge branch 'internet_archive' into internet_archive_mthread
IA: cleaning empty subjects and spatial fields
minor IA multi-threading part re-factoring
Merge branch 'internet_archive' into internet_archive_mthread
Merge branch 'develop' into internet_archive_mthread