Script Summary: Adds a couple of filter options to IAmA type subreddits.
Three buttons are added to the tab bar...
'Q' - Display top level questions only. Handy if it's your IAmA or you just want to see what's been asked.
'A' - Display only questions which have answers by the OP, hide any questions & discussion which doesn't have a response by the OP.
'D' - Display everything. Questions, answers & discussion (reddit default).
Currently the script operates in /r/IAmA/, /r/AMA/, /r/ILiveIn/ and /r/redditoroftheday/
