Fix some HTML bugs after merging PR from Vijay (switching from HTML injecting to appending)
Fix some HTML bugs after merging PR from Vijay (switching from HTML injecting to appending)

tungnguyenson/gmail-to-trello-extension,tungnguyenson/gmail-to-trello-extension,tungbi/gmail-to-trello-extension,acoven/gmail-to-trello-extension,acoven/gmail-to-trello-extension,tungbi/gmail-to-trello-extension