Issue #20: Initial work adaptively choosing stepsize for adaptive sampling.
Issue #20: Playing around with paramter for sampling.
Issue #20: Probably a better approach for adaptively determing step size.
Issue #20: try to find correct stepsize increase.
added some comments for gaussian taylor based fragment shader. Minor cleanup in code.
Issue #25: Found an indicator when this inf bug can happen. fixed constants upper and lower for (u,v)=(0,0) to (0,45) steps.
Issue #25: Further tweaks of gaussian taylor based shader regarding bug finding.
Enhanced shader paramter passing: now a user can pass a neighborhood radius within range [0,4]. Defined some scene setups for testing purpsos for snake patches.
Issue #27: Implemented snapshot feature.
further work on the gaussian taylor based fragment shader: new apporach for computing the specular part.
Initial work on passing a body texture for a given shape.