beezdiscounting 0.2.0

New features

• score_mcq27() properly supports arguments: impute_method, random, return_data, and verbose.
  See documentation and the README for explanations.

• generate_data_mcq() can generate fake MCQ data, including seed and prop_na arguments for
  reproducibility and specifying proportion of NAs.

• long_to_wide* and wide_to_long* are helper functions to reshape data from/to different formats.

Minor fix

• When no imputation is specified and NAs exist in the data, score_mcq27() returns NAs for the scoring
  instead of 1.