Rp should not auto close rtc.

Update parser to follow HTML5 spec change at:
https://github.com/w3c/html/commit/c61397b989b28235ee2228f280aa8d475f3b9ebf
Merge pull request #1 from aYukiSekiguchi/rp-not-auto-close-rtc

Rp should not auto close rtc.