#488 Improved combinedsearch apiv2 resource
#488 added distance_to_target sound field for queries that include content_based target
#488 fixed bug with group_by_pack when doin standard text search in combined search
488 bugfixed gorup_by_pack in combined search
#488 allowing group_by_pack in combined search
#488 added compute_crc step at file upload process
Merging with apiv2_sergio
#488 Updated TODO
#488 Rating GET and POST methods added