Add some failing tests for HTML comments
Add some failing tests for HTML comments

mdiep/MMMarkdown,albertbori/MMMarkdown,mjzac/MMMarkdown,isaacroldan/AttributedMarkdown,babbage/MMMarkdown,jonesgithub/MMMarkdown,cnbin/MMMarkdown,isaacroldan/MMMarkdown,albertbori/MMMarkdown,1aurabrown/MMMarkdown,AgileBits/MMMarkdown,isaacroldan/MMMarkdown,iosdev-republicofapps/MMMarkdown,gonefish/MMMarkdown,iosdev-republicofapps/MMMarkdown,mjzac/MMMarkdown,1aurabrown/MMMarkdown,AgileBits/MMMarkdown,mobilejazz/MMMarkdown,gonefish/MMMarkdown,babbage/MMMarkdown,jonesgithub/MMMarkdown,isaacroldan/AttributedMarkdown,isaacroldan/AttributedMarkdown,isaacroldan/AttributedMarkdown,mobilejazz/MMMarkdown,albertbori/MMMarkdown,isaacroldan/AttributedMarkdown,mdiep/MMMarkdown,cnbin/MMMarkdown