Emily Eisenberg 4d2e46e7f6 Remove trailing commas for IE 9 compatibility ...

Summary: IE 9 doesn't like trailing commas. When we introduced eslint, we added
a bunch of trailing commas, which makes IE 9 sad.

Test Plan:
 - `make lint`
 - Visit http://localhost:7936/ using IE 9 on browserstack.
 - See that the math loads, and there are no errors in the F12 developer tools.

@kevinb

2017-01-06 19:06:01 -08:00

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Remove trailing commas for IE 9 compatibility

2017-01-06 19:06:01 -08:00