Baxter simulator for ros testing - enable robot and untuck robot [2]

[alecive]

Hello,

I am trying to set up travis builds with an headless gazebo server to perform ros tests and integration tests. I am having a number of problems, which I will place in independent issues for the sake of sanity.

Problem 2 is that by default the robot is disabled and tucked. For my purposes, I would need a single launch file in which the simulator is called, and AFTER everything boots up properly, I would need the robot to be enabled and untucked.

Is it possible to do so? Ideally, I would like to have an input argument in the baxter_world.launch file.

See #114 and #116 as well.