Allow parsing json with quote

[dyu]

Currently, GeneratorOptions.strict_json allows serializing fields with quotes.
Parser.Parse fails when the json source contains fields with quotes.

[ghost]

Thanks, will fix.

[ghost]

Just looked, but this was already in the current code. I can write field names with quotes. Anything in particular that's not working?

[dyu]

Sorry, false alarm. I edited test/monsterdata_test.golden and quoted the fields, which gave errors when running flattests (I assumed it was the parser that balked).
Turns out, I had to add this line in ParseAndGenerateTextTest for the equality test:
opts.strict_json = true;