Quick update which sets teh replayer to null in the tearDown function.
Quick update which sets teh replayer to null in the tearDown function.

This prevents crashes due to replayer existing from previous runs.  Previously, each test was setting replayer null manually, but since reset is now called in BasicTasks constructor, that solution no longer worked.
lino2014/marioai,lino2014/marioai,ibush/MarioAI,ogregoire/marioai,ibush/MarioAI,pgkaila/marioai,Rey-17/marioai,Rey-17/marioai,pgkaila/marioai,pgkaila/marioai,tectronics/marioai,ibush/MarioAI,ogregoire/marioai,lino2014/marioai,tectronics/marioai,ibush/MarioAI,Rey-17/marioai,ogregoire/marioai,Rey-17/marioai,pgkaila/marioai,tectronics/marioai,tectronics/marioai,ibush/MarioAI,ogregoire/marioai,ibush/MarioAI,lino2014/marioai,Rey-17/marioai,tectronics/marioai,lino2014/marioai,pgkaila/marioai,ogregoire/marioai