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You can use the <arg> tag to pass arguments to your launch files on the command line: http://wiki.ros.org/roslaunch/XML/arg

In your case, something simple like this would probably do:

<launch>
  <arg name="world" default="lawnbot_tutorial_gas_station"/>
<!-- We resume the logic in empty_world.launch, changing only the name of the world to be launched -->
  <include file="$(find gazebo_ros)/launch/empty_world.launch">
    <arg name="world_name" value="$(find lawnbot_gazebo)/worlds/$(arg world).world"/>
    <!-- more default parameters can be changed here -->
  </include>
</launch>

And then on the command line, you would do:

roslaunch lawnbot_gazebo lawnbot.launch world:=bot_test_world

Or

roslaunch lawnbot_gazebo lawnbot.launch world:=lawnbot_tutorial_gas_station

and it would load the desired world file from the lawnbot_gazebo package.