improved date entry--#11
added date validations under issue -#11
Added date validations under issue -- #11
Changes made  to the validation messages of Date field under issue (#11)

when the Birth Date field left blank throws “the information is
required” otherwise throws “invalid Date specific”.
Update Donor validation to validate birthdate

Validate birthdate:
- not null
- valid values for date fields
- future dates
- within Age range
Changed birth date field format in edit donor form(#11)

-- still to be worked on validation --
Added validation on birth date field of Add Donor form(#11)
Revert "Added validation on birth date field of Add Donor form(#11)"

This reverts commit 9fcaefb559a442f01ca8f80e634f10e59e8c8e32.
updated validation on Date Entry Field on Donor Form(#11)

--- all fields mandatory --
-- non numbers --
updated year field on edit donor form(#11)

-- updated year field--
--added validation message  on birth date field on edit donor form--
Merge branch 'develop' into Improve_Date_Entry_#11

Conflicts:
	src/backingform/validator/DonorBackingFormValidator.java
Merge pull request #133 from jembi/Improve_Date_Entry_#11

:+1: