bulk_writer: changed handling of single-row dataframe parsing to JSON
elastic_update: changed function to return instead of print appData on error
ud_update: Changed nested lists to flat lists, and added start and end character positions
modelizer: Minor update to feature keyness, using absolute values now to determine the most informative features for a class (so features that are either strongly postively or negatively related to the class)
bulk_writer: Added the 'ver' parameter to include a short version string with each update. Mostly to deal with updates that do not complete successfully on all data
This is because R apply treats rows of single values as a matrix, while it treats rows containing lists as (named) list. This has the nasty result of getting subvalues when using to JSON. i.e. computerCodes.actors = [list, of, ids] becomes computerCodes.actors.ids = [list, of, ids].