I have made an animation that does not render properly, it will start to render the first couple of tiles and then just stop completely, not progressing any further. I have visited this other question: Came back to a blender file, now not rendering, and tried that solution but to no avail. My issue is practically identical to that question though.
I tried to render your scene and I have no issues. I noticed "Square sample" was checked so you had to much sample to render. Try to render with "Square sample" unchecked (Properties panel -> render -> sampling).
And just for advise, if you are rendering with the CPU, set the tiles to 16*16 instead of 64*64 it sould be a little bit quicker