TRUNK-3177 add javadoc for the class Allergy
TRUNK-3177 fill javadoc for the class Allergy. Did the necassary changes according to the review
TRUNK-3177 fill javadoc for Allergy class. I made some minor changes on the @since 1.7
Merge pull request #293 from sashrika/TRUNK-3177

TRUNK-3177 add javadoc for the class Allergy