Various fixes

[rwz]

Also, fixes #74

[sferik]

Not sure about disabling quirks_mode by default. I assume some people depend on that behavior.

[rwz]

From what I've found in json_pure source code, quirks_mode is only used to enable parsing/generation of arrays/objects. And nothing else. So, the workaround is doing the same thing, but doesn't involve regexps which may fail on strings containing weird UTF8 characters.

[rwz]

Also, user may still pass quirks_mode as an option or even add it to default options.

Sorry, closed accidently

[morgoth]

I confirm, that it fixes problem with UTF-8 encoding

[sferik]

Also, user may still pass :quirks_mode as an option or even add it to default options.

Is this actually true? I'm taking another look at 696d594 and it appears that :quirks_mode is no longer accepted as an option. All options other than :symbolize_names appear to be dropped. I'd love to see a spec that show that options, such as :quirks_mode are successfully passed through to the adapter.