Changed name for reactor thread attribute and join thread on stop

Ignore-this: 48ce2b9f86841dee3afb1a430ec9783f

darcs-hash:20100909175751-56b4d-28b5b4fd536994626adb8d08db4474e6065f2143
Fixed waiting timeout for engine shutdown

Ignore-this: 398a1f0cb48cd394b8d144c2a919d98b

darcs-hash:20100910122806-56b4d-1e2dbc97b32b645bef3f60b15c5b5fc7858c36b3