def find_by_uni(uni)
      entries = search(base: "ou=People,o=Columbia University, c=US", filter: Net::LDAP::Filter.eq("uid", uni))
      (entries.count == 1) ? entries.first : nil
    end
def find_by_uni(uni)
      entries = search(base: "ou=People,o=Columbia University, c=US", filter: Net::LDAP::Filter.eq("uid", uni))
      (entries.count == 1) ? entries.first : nil
    end
LDAP lookup based on UNI. If record could not be found returns nil.

 @param [String] uni
 @return [Cul::LDAP::Entry] containing all the ldap information available for the uni given
 @return [nil] if record for uni could not be found, or more than one record was found