hexojs / hexo / 1144

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848 hierarchical categories (#2734)

* Hierarchical categories can be assigned

The code still needs some cleanup, but the new test passes without
breaking the old ones.

* more tests, cleanup

added tests for category list and front-matter processor to include
multiple categories; cleaned up Post.setCategories() code

* -whitespace

* --no-fat-arrow

CodeClimate didn't like 'em...

* Added test for dupe parents

ensure we do not create a duplicate post/category xref for duplicate
parent categories

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