refactored mongodb operators to use Connectable interface instead of DBConnector
added apache log generator demo
Merge pull request #852 from davidyan-malhar/apachelog_pull

added apache log generator demo
timestamp should reflect the current time
Merge pull request #854 from davidyan-malhar/apachelog_pull

timestamp should reflect the current time
added application to process data from log generator
Merge pull request #855 from davidyan-malhar/apachelog_pull

added application to process data from log generator
added referers
Merge pull request #856 from davidyan-malhar/apachelog_pull

added referers
Merge pull request #851 from ashwinchandrap/dbconn

MLHR-721 #comment refactored mongodb operators to use Connectable interface instead of...
minor
Merge branch 'master' of https://github.com/DataTorrent/Malhar