Fan Zhang bfa3029c8e Cleanup and add category doc ...

- Clean up some useless or vague comments. Fixed typos
- Add illustration for CategoryExpender and implements structs

2018-02-08 10:47:05 -08:00

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BUILD

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categories_test.go

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categories.go

Cleanup and add category doc

2018-02-08 10:47:05 -08:00