animate particle color at frame 1 if you're using age% as the animation reference

This is probably obvious if you think about it, but since I just spent a couple of hours trying to figure out why my particles were rendering grey and not the animated colors I had set, I figure it's worth blogging. If you are using age% animation reference for the particle color, make sure the colors are animated at frame 1. Otherwise depending on what frame you are animating the emission at you may only get the last color of color animation.