add seg_depth package
add launch dir and files to demonstrate use of seg_color.
add README file to seg_depth/seg_depth_launch/launch dir
to commit all changes for now...
Merge pull request #13 from sigproc/add-seg-depth-pkg

Add seg depth pkg
Copy segment_rgb source dir to _file and _fast copies. The _file dir is not to be touched, and holds the current,
'hacky' implementation. Progress will be made on the _fast dir, namely converting the file from Mat to ppm without having to
write to file.
update CMakeLists.txt and source files for new development
update color segmentation (fast)  to convert from Mat to image<rgb> this is noticably faster
demonstration of depth before I change things
edit segment_depth files for successful segmentation of depth image from qbo
Fix bug so that outgoing message can be viewed with image_viewer
seg depth with 1 channel segmented working
segmentation of depth normal compiling but with run-time errors
segmentation based on image normals now working
segmentation and merging of normal and depth maps successful
add normal image to published output on topic /camera/depth/normal
Refactored Code for start of term
Merge pull request #14 from sigproc/progress-on-seg-depth

Progress on seg depth
added joypad control to the qbo_ratslam launch file