add replies() and retweets() methods

replies(false) - filters out tweet replies - see exclude_replies
retweets(false) - filters out reteets - see include_rts

by default retweets and replies are included

differently than Twitter API we do try to render `count` numnber of
tweets - asking for more and then trimming the results if we got too
many
unpin deps

should be pinned or shrinkwrapped by application
Release 0.3.0