Add a rudimentary 'Date of Birth' search box in Patron Search interface.

Add a rudimentary 'Date of Birth' search box in Patron Search interface.

This is a rudimentary way of adding the ability to filter patrons based on their DOB.
The tricky part, however, is that just simply tries to match the dob timestamp passed from
the database.  Therefore, all searches must be in YYYY-MM-DD format.  Partial searches will
only work when they begin with a year (for example, YYYY-MM) in the string.

Signed-off-by: Michael Peters <mrpeters@library.in.gov>