new package: face_detect

Add stub package created via ``catkin_make_package``.
face_detection: fill in package.xml todo-s

Add myself as maintainer and set the license field. Add a copy of the
MIT license.
new package: face_detection_msgs

This package contains definitions for various custom message types
useful for face detection. Specifically it creates a custom ``Face``
message type which contains a bounding box (or "region of interest") for
a face and a ``Faces`` message which contains an array of ``Face``
messages.

Note that this is the first package in our stack which requires
building. If you are using the Docker-based workflow, you can simply
build the stack via ``make build``. (Or ``make`` since ``build`` is the
default target.)
face_detection: initial implementation

This is an initial implementation of the ``face_detection`` package. It
provides two nodes: ``face_detect.py`` which does the actual detection
and ``highlight_faces.py`` which may be used to draw boxes around faces.

See the ``README.md`` file in the commit for more information.
Merge branch 'master' into face-detect-example

Conflicts:
	src/Dockerfile
face_detection: fix logerror vs logerr

The function to log an error in rospy is spelled "logerr" and not
"logerror".
Merge pull request #8 from rjw57/face-detect-example

Face detect example