#44 Dataset upload with associated features

[Nina Jeliazkova]

as specified at http://opentox.org/dev/apis/api-1.2/dataset

Upload an sdf that contains features of an already existing dataset (if a feature name in filename.sdf matches a feature name from associated_features the corresponding URI is assigned)
curl -X POST -H 'Content-Type:chemical/x-mdl-sdfile' --data-binary @filename.sdf -d 'associated_features=feature_uri' -d 'matcher=Name' http://host/dataset