Add rospy as a dependency.

Remove kraken_visulatization.
Added all the source files.

Look at the master tree of this repository for detailed history of these files.
Add the keyboard_control executable.
Add the bash script for running the keyboard control module.
Removed the bash definition at the top of the script file
Move the code to create window to the top of the file.
Fixed the script.

See https://github.com/iit-kgp-auv-team/kraken_3.0/issues/40.