Psys demo 1: AABB

Ok, so I have added a kill() routine as well as another routine to compute an
Axis Aligned Bounding Box for the Particle system along with another routine to
draw this AABB.

Psys demo 1: AABB from bhavesh pandey on Vimeo.

Now, I would quite like to implement 2 more things into this.
1) Ray / Intersection capabilities akin to Houdini's Ray SOP for basic collision detection etc.
2) An accelerated data structure for fast neighbour lookups.

After this I'm pretty sure I'll have most of the things I'll need for the time ( :D )
I would like to spend some  time cleaning the code and then profiling + optimising it further
along with some other projects I have in mind.

Will post another update later..

Ciao.