Paul's TweetStream class
import cleanup and DRY
reset data refresh loops upon newquery 'go' button clicked
until we can fix mapr-storm catcher handling nonexistent data file, we touch 'tweets' catcher file
pick up changes in twitter query & reduce logging in storm topo
catch ServiceException
Merge pull request #4 from boorad/master

tried to get changes picked up by topo, counters reset, etc.  WIP