Fix mobile-app rendering when admarkup contains lowercase DOCTYPE tag #245
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Admarkup containing an html DOCTYPE tag
<!DOCTYPE html>
prevents rendering with postscribe.The uppercase tag did get removed since #210, but the lowercase
<!doctype html>
(which is valid HTML) did not get removed. Now it does by making the regular expression case-insensitive.This came about because ad markup returned by Amazon APS bids uses lowercase doctype.