infragram in GL doesn't accept JS Math.foo() functions

I tried `Math.floor(R)` but it got converted to:

```
float rr = r.r(r);
```

I think it probably happens around https://github.com/p-v-o-s/infragram-js/blob/master/public/infragram-gl.coffee#L113 but am not sure 

I also know we have to get rid of `.toLowerCase()` and I'm getting rid of .toUpperCase() in the -js version, so that it doesn't turn Math into MATH.
