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You've got the package name wrong, it's stage_ros not stageros and the executable name is stageros not stage_ros (confusing I know). When I run that command:
$ rosrun stage stage_ros roomba_isr_floor0.world
On my Ubuntu 12.04.5 Hydro install I get an error that it cannot find the world file (expected) but if does find and run stageros:
william@ubuntu:~$ rosrun stage_ros stageros roomba_isr_floor0.world
[FATAL] [1438216243.460273767]: The world file roomba_isr_floor0.world does not exist.
[Loading roomba_isr_floor0.world]err: unable to open world file roomba_isr_floor0.world : No such file or directory (/tmp/buildd/ros-hydro-stage-4.1.1-6precise-20141231-2201/libstage/worldfile.cc Load)
Stage: User closed window
It looks like that tutorial needs to be updated. If you figure out what it should be please feel free to update the tutorial.
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