- Add prop_std_error, which is std_error scaled by the number of   reports. - Change upper_bound/lower_bound to prop_low and prop_high.  They are   now defined as fit$proportion +/- fit$prop_std_error.
- Add prop_std_error, which is std_error scaled by the number of
  reports.
- Change upper_bound/lower_bound to prop_low and prop_high.  They are
  now defined as fit$proportion +/- fit$prop_std_error.

google/rappor,google/rappor,google/rappor,google/rappor,google/rappor,google/rappor,google/rappor,google/rappor