Added Death animations for critters

Squashed commit of the following:

commit beecea8621e9d0bc79349b88fa100fa1251613cc
Author: Caskman <eric.cascketta@gmail.com>
Date:   Fri May 10 09:25:13 2013 -0700

    switched the particle death back to random colors with fadeout

commit ecaac68b932f67e58afa5a8ec82dead0a7225629
Author: Caskman <eric.cascketta@gmail.com>
Date:   Fri May 10 09:11:57 2013 -0700

    moved ticking into gamemodel
    added expired property to irigidbody
    got particle hot temperature fading started but it's not quite right yet

commit 00e9abddae991571cad76a943722a3326db4bc05
Author: Caskman <eric.cascketta@gmail.com>
Date:   Thu May 9 13:56:11 2013 -0700

    checkpoint

commit fd75b76ef0b929779e1d09935da47d6f43d8334e
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 11:46:05 2013 -0700

    checkpoint

commit 46a3f070e61c46a380c1c9ce4f0d9b532006b5be
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 11:42:35 2013 -0700

    checkpoint

commit dd7dd02a540db7fff003cc5e1b0bd036fc3228cb
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 11:39:42 2013 -0700

    checkpoint

commit 1395180a641428c21dc554a8d0c6c8edb67c3162
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 11:35:08 2013 -0700

    refactor

commit 1aafcb0a65d2e8fc064e928e6f911891c63e9dfa
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 11:31:14 2013 -0700

    checkpoint

commit 5c4d200f708875cb5b610b9a96f7e29a47a24d84
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 11:15:49 2013 -0700

    checkpoint

commit d72ddfa79a56d41e9cac1f9fa7c72881183339a5
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 10:53:01 2013 -0700

    checkpoint

commit 8f8e0fdeeef7158117f59da9ee5c843d50473926
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 02:56:39 2013 -0700

    checkpoint

commit 2cbb37d822ca3ed9bb7a0173ba04b84a2b7dccbf
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 01:30:40 2013 -0700

    checkpoint

commit 7672004c8d05c61cf0efa70266ec35f44bd3006b
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 00:02:56 2013 -0700

    documented melee critter

commit 61c6ae983d1989a00962b72709cf5106c86bd0f4
Author: Caskman <eric.cascketta@gmail.com>
Date:   Tue May 7 00:01:41 2013 -0700

    checkpoint