Use double quote for transformed displayName

[chenglou]

JSX currently transforms everything to double quote except these two. This way, it's at least consistent and will satisfy half of the people who do put a strict quotation linting on their project.

Test: jest, check the double quoted transformed data-bla="something".

[jeffrifwald]

@chenglou There is also an issue with the quoteAttrName in the xjs.js transform file. The markup data-attr="testing" would be turned to 'data-attr' in the transformed source. So you will only pass linting if you don't have dashes in your element attributes. I have attempted to make that all configurable here: #1709

[chenglou]

Cool! I'll leave this as a backup then. Will close once yours get merged.

[zpao]

We may move to recast before we ship another release but whatever. Want to rebase and do the quoteAttrName as well, then we'll merge this in?

[chenglou]

Done.