Implementing hardware_camera through ROS driver libuvc_camera

[Suryansh470]

https://answers.ros.org/question/218573/running-2-different-cameras-using-usb_cam/

https://rosstitchernode.wordpress.com/2014/06/05/ros-and-opencv-with-usb_cam/

http://wiki.ros.org/libuvc_camera

Check this out ...... for implementation

[Suryansh470]

Since libuvc_camera has a bug of not identifying camera with serials ...... or in any case ... we are not able to operate 2 cameras with it ... so we are using usb_cam and also we implemented udev rules to assign specific device nodes to both the cameras for no confusion....

[Mayankm96]

Alright! Looking forward to the pull request! :)