Configurable quotes

The transformers currently return both single (addDisplayName and quoteAttrName) and double quotes (JSON.stringify) in the transformed result, so it is impossible to enforce quote rules. I've added an option called useSingleQuotes that decides if double or single quotes should be used throughout. I may be missing other cases, but this seems to address the issues I have had.




Yep, will do for this and quoteAttr. I am uncertain if it makes sense to introduce JSON.stringify for these values, so these two cases will be kept separate from `xjs.js` line 193-195 unless we decide all 3 values should be passed through JSON.stringify.