Fixed bug where draw would not be declared. Updated so title displays who wins.

TicTac/BoardEntity.h
  - Made PLAYER_ONE, PLAYER_TWO constants public
  - Added counter for number of spaces left
TicTac/BoardEntity.cpp
  - Decremented counter in place() methods
  - Added check for a draw
TicTac/TicTacApp.h
  - Added m_title private member for title of window
TicTac/TicTacApp.cpp
  - Updated update() to change the title of window based on game ending conditions