Removed old Kinect files (URDF, Xacro, mesh).
Added collada & texture for ASUS Xtion Pro Live.
Added Gazebo plugin for RGBD sensor
 - Mimics an OpenNI sensor e.g. Kinect/Xtion
 - Publishes MONO8 format "depth" image & PointCloud
 - Publishes RGB8 format color image & 2nd copy of PointCloud (for registered)
Added collision STL mesh from convex decomposition
Added file to store calibration values for sensors
Added xacro macro for ASUS Xtion Pro Live sensor
    - visual model, without base
    - collision geometry
    - TF frames
    - loads Gazebo plugin

    Note: There is a bug that Gazebo in ROS Fuerte ignores the roll/pitch/yaw in the visual tag,
          therefore it needs to be in a separate link, with the orientation specified at the joint.

    ToDo: Fix visual mesh, re-scale it, & the origin is not centered along the frontal axis.
          Can simplify collision mesh.
          Rotate origin in mesh, to match the orientation of the base link and bypass the bug.
Added REEM model with head-mounted ASUS Xtion.
Modified REEM launch with optional RGBD sensor.
Uploaded new collision  mesh for ASUS Xtion:
  Rviz was crashing while trying to read STL mesh saved in ASCII format with Meshlab. Re-saved as binary format.
  ROS is supposed to read both formats.
Fixed bug with placement of Xtion IR optical frame
Merge pull request #1 from DavidB-PAL/master

Add option to launch REEM with a head-mounted ASUS RGBD sensor. Defaults to no sensor.
Update contributing authors list.
Update copyright date for recently added files.
Use more descriptive head depth sensor name.

- Remove hardcoded _rgbd suffix, let name parameter set it.

- Name parameter changed to head_mount_xtion, instead of head_mount_rgbd, as
  confusing topic names were appearing, eg. head_mount_rgbd_rgb.
Remove code duplication.

When launching reem with the head-mounted ASUS Xtion Pro Live, include the file
containing the stock REEM, instead of duplicating its contents.
Update ASUS Xtion Pro Live model.

- No longer compensate mesh non-standards compliance in URDF:
  - Scale mesh to meters.
  - Re-orient mesh origin.

- Make visualization texture darker.

- Use box collision geometry instead of a more expensive convex decomposition.
.
Rename ASUS sensor files and folders consistently.
Workaround Gazebo 1.0.2 bug with RGBD sensors.

There seems to be interference between the collision geometry and the camera image
and generated pointclouds of the ASUS xtion pro live sensor.
Change sensor material properties.
Silence Gazebo startup warnings and errors.

- Add dummy inertia to links.
- Manually add missing expected collada atttribute to transparency element.