Make the Overview page render.
Remove inline styling from the missions overview page.
Use a common partial for the Missions Navigation page.
Wrap a div around the entire document so we can have CSS without long prefixes.
Implemented more relational properties.
Use the new model design.
Clean up the Show template.
Move the route to be together with the rest of the mission resources.
Make the has_many relation return the correct type for missions and trainings.