Create separate snapshot files for each component

[i-like-robots]

Because all component shapshots are currently pushed into a single file I am worried that any changes to components not currently under test may not be caught as I suspect people may only look at the part of the diff related to their component.

[apaleslimghost]

snapshot file paths are generated by the name of the test file that's generating them, and it's currently not configurable 😕 https://github.com/facebook/jest/issues/2676