Apply column name filtering

[sk-sahu]

cloudos/R/cb_extract_cohort.R

Line 92 in e240e8d

#"columns" = columns, # TODO

Based on

cloudos/R/cb_json.R

Line 79 in e240e8d

# TODO work on column - At this point NO end-point that returns this information, there are cards

[sk-sahu]

Done #17