Merge pull request #45 from bulwahn/hydro-devel

check for CATKIN_ENABLE_TESTING
add missing dependency
add cv_bridge dependency
use the PointCloud2Iterator
remove broken test
adds conversion (if necessary) of the images for the calculation of disparity
- corrected unnecessary tests in converting the pair of images
Merge remote-tracking branch 'upstream/hydro-devel' into hydro-devel

Conflicts:
	stereo_image_proc/src/nodelets/disparity.cpp
Merge branch 'hydro-devel' of github.com:diegodgs/image_pipeline into hydro-devel

Conflicts:
	stereo_image_proc/src/nodelets/disparity.cpp