added a first condition and event birth date changed

CRM/Civirules/BAO/Rule.php

CRM/Civirules/Conditions/BirthdayChanged.php

CRM/Civirules/Conditions/Condition.php

CRM/Civirules/Conditions/FieldChanged.php

CRM/Civirules/Engine.php

CRM/Civirules/Event/EditEntity.php

CRM/Civirules/EventData/Edit.php

CRM/Civirules/EventData/EventData.php

CRM/Civirules/EventData/Interface/OriginalData.php

CRM/Civirules/EventData/Post.php

civirules.php