catkin_tools build system for Atom

Uses the atom-build package to execute catkin build for the catkin_tools package.

• Assuming the open project is either a catkin_tools workspace or a ROS package, this executes the catkin build command.
• Notice that as for now the catkin_tools workspace must have been built once.

Thanks to build-cmake from which this package is largely inspired.

** Note This package requires atom-build to be installed.

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TODO :

• enable options.
• choosing ROS_VERSION to be sourced.
• passing args to catkin build.
• option to clean first.
• allows for custom source path.
• support for catkin_make.