Fix test for IE7/IE8 build

[sophietk]

Wrapping test object keys as string to avoid IE7/IE8 error (reserved identifiers).
Tests were added with #3667 : https://travis-ci.org/jashkenas/backbone/builds/66548299.

[jridgewell]

Thanks for looking into it!

[akre54]

Grr oldIE.

Thanks for the quick fix.

[megawac]

Hmm, we should set up (actually run) linting for backbone
/cc @michaelficarra

[michaelficarra]

Yes, probably. A linting step is basically free, and takes 5 minutes to set up. I suggest someone with more familiarity with the project than myself does this, though.

[akre54]

It's already set up. We could use eslint, like Underscore, too though.

[megawac]

It's already set up. We could use eslint, like Underscore, too though.

Yeah but we don't run it through CI and haven't updated it in a long time

[akre54]

For sure, but it would be a one line change to set it up with CI. I'd be fine just cribbing Underscore's .eslintrc here.

[michaelficarra]

If the projects follow similar styles and have similar browser support, I'd say that's a good idea.