CAD world and tilt laser 

Bug fixes:
#1774
#1807
#1806

Tilt laser joystick - working, but slow
Guardian ship interior, minor laser fixes

CAD related files were not on last commit and were now renamed to
ship_interior.

Lasers were updated to match datasheet. 

Tilt laser with joystick command and tilit limit #1820
Tilt Laser frame bug fix, ship_interior map

Tilt Laser bug fix : #1824
added ship interior map to guardian_navigation
guardian_office.launch updated to not duplicate code from
guardian.launch
guardian_robot_control and laser fix

guardian_robot_control - cmd_vel topic is not hardcoded, but param
lasers 

laser - new angles....
guardian robot control - wheels and tilt separation

guardian_robot_control - doesn't command wheels nor pubs wheels' joints,
now only commnads tilt laser. All topics subscribed are now params
(yaml).

guardian_control - wheels' controllers deleted

guardian.gazebo, guardian.urdf.xacro - camera was commented out.
Guardian two lasers

guardian2lasers.dae & .stl added to meshes folder
guardian chassis updated to guardian2lasers in guardian.urdf.xacro
lasers positions updated
laser collision fixed #1770
Merge pull request #2 from inesc/groovy-devel

Guardian two lasers simulation