Added log4j.properties file, decreased logging level.
Disabled logging Blockmanager warnings.
Updated readme.
Added spark-streaming-twitter dependency, switched twitter4j-stream version to 3.0.3 (4.x seems to be not supported by spark-streaming-twitter).
Introduced separate Util object
Updated readme.
Printing tweet id.
Increased timeout in TwitterStream to 60s.
Implemented printing 10 most popular hashtags in last 60s (counting over 60s window moving every 1s)
Logging SparkUI URL
Updated readme.