0.55.0

• Fixed graphical glitches caused by icons overlapping the edge of the editors on the Gnome desktop.
• SceneProcedural now renders general VisibleRenderables too.
• Fixed SceneReader to read animation at the correct speed (issue #68).
• File->Quit and the window close icon now prompt the user to confirm before closing if there are unsaved changes (issue #19).
• Added support for shader parameters of type “shader” in the RenderManShader node - these are mapped to plugs which accept connections to other RenderManShaders, allowing the creation of networks of coshaders.