Fix exception throwing in Date.

Change-Id: I6d0ca3ca95126ca8aaa6367b01ec18cd48ab445f
Implement IllegalArgumentException

Change-Id: I00717a96a5864835548a99d58f71dd3fccf2b528
Implement menu

Change-Id: I26f0cb73df41344a79c80635d2c18ff3fd629b56
Basic implementation of Student class.

Change-Id: I070c22ff52f451ad0d92a2b39f627e8b9f707f6d