Prepared projet for Windows compilation.

Signed-off-by: Vinicius Gardelli <gardelli123@gmail.com>
Created a "toString" function to deal with compilation issues on win32 platform.

Signed-off-by: Vinicius Gardelli <gardelli123@gmail.com>
Extracted class Rectangle to its own file.

Signed-off-by: Vinicius Gardelli <gardelli123@gmail.com>