Implement a stage to render an osg scene
Rename OsgSceneStage -> OsgRenderStage
Implement setting the viewport on OsgRenderStage
Add support to pass keyboard and mouse events to an OsgRenderStage. The connection has to be created manually by the painter, though
Remove todo regarding target FBO from OsgRenderStage, since that is the responsibility of the painter
Merge branch 'master' into osg_pipelines
Merge pull request #21 from hpicgs/osg_pipelines

Osg pipelines