Add directors to movie info

[jshearer]

This is going to get interesting (and fun!)

• [x] #8 Create new models for people associated to video
• [ ] #9 Get associated people info from Facets
• [x] #11 Modify JSONbuilder for video
• [x] #21 Add HTML/Angular code to display directors alongside country, year etc.
• [ ] #18 Gather possible association types for supporting_role_types

[jshearer]

This could be complete, just depends on actually getting the data from Facets @lobrewis @bluecontainer