fix mrn field source.

update OnCore Fields Definition Example

fix bug when first enabling protocol.

fix with boolean.

Update README.md

fix bug with null values.

Merge pull request #202 from susom/ihab

cast redcap record id to a string.

Merge pull request #200 from susom/ihab

change IRB number to text instead of int.

Merge pull request #199 from susom/ihab

add ENT_QUOTES to htmlentities

Merge pull request #198 from susom/ihab

if race is empty fill from redcap.