V2.0 streaming capturing

DO NOT MERGE!! Open for review.

TODO:
* ~~Insert library back into the captured document~~
* ~~Move meta tags into main document~~
* ~~Move title tag into main document~~
* ~~Move HTML/HEAD attributes into HTML/HEAD tags in iframe~~
* ~~Solve referer issue~~
* ~~Fix window.location.~~
* ~~Pass a capture object instead of a captured doc to the chunk callback~~
* ~~Fix iframe issue on Android 2.3~~
* ~~Fix Jazzcat tests~~
* Write amazing tests