added support for uniform1fv

[adicirstei]

Hi,

I noticed that when passing arbitrary length array uniforms the library is throwing an error.

glsl.setUniform('u_rands', 1.0,0.2,0.3,1,0.5); 

I looked around and found that uniform1fv method expects a single argument with the array:
https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/uniform

void gl.uniform1fv(location, value);

Best regards,
Adrian