Removing marathon_gui from strands_ui

To get rid of ap_msgs dependency. Is now in attic branch: https://github.com/strands-project/strands_ui/tree/attic
Merge branch 'hydro-devel' of http://github.com/strands-project/strands_ui into hydro-devel
Merge pull request #46 from cdondrup/hydro-devel

Removing marathon_gui from strands_ui