Pulitzer Prize winner and "To Kill A Mockingbird" author Harper Lee smiles before receiving the 2007 Presidential Medal of Freedom in the East Room of the White House November 5, 2007 in Washington, DC. April 28th is the 100th anniversary of the birth of the "To Kill A Mockingbird" author. (Chip Somodevilla/Getty Images)I owe two apologies. The first is to Virginia L. Allison, a middle school English teacher whose classroom copy of “To Kill a Mo…