Fixing invalid iterators if filtered_cloud_topic is not set.
Adding missing dependency on sensor_msgs.
Fixing indentation, whitespace, and tabs.
Incrementing PointCloud2Iterator pixel-at-a-time, not byte-at-a-time.
Merge pull request #504 from jasedit/indigo-devel

Fixing segfault if filtered_cloud_topic is not set in PointCloudOctomapUpdater