Remove grunt-svg-sprite

[taoeffect]

Problem

grunt-svg-sprite adds too many dependencies, (including a phantom-js download!).

I get that it's useful to be able to automate the optimization of SVGs, but it would be nicer if instead they can just be saved pre-optimized in the repo, without grunt-svg-sprite and all of its dependencies. Plus we need to remove dependencies in general (#372).

Solution

Remove grunt-svg-sprite and run npm dedupe, add all pre-optimized SVGs (optimizing using whatever third-party tool you'd like) instead of originals to the repo.