Rename 'Spatial Object Display' to 'Vessel Display' in Welcome
Merge pull request #62 from matthieuheitz/RenameSpatialObjectsDisplay-to-VesselDisplay

Rename 'Spatial Object Display' to 'Vessel Display' in Welcome
Fix the compilation order of modules in VesselView

This prevent the application from trying to build its modules before
TubeTK's. This would break first-time build since the application module
rely on TubeTK modules (Tortuosity needs SpatialObjects).