add an extra info message when the user is redirected to the settings page for
the first time
fix using backends when hostname is an IPv6 address (fixes #194)
factor out movie name typeahead data retrieval to a separate method
map the "cast" attribute to actual Actor models
add a method for retrieving a list of all actors, filtered by the type
of work they appear in (movie or TV show)
implement typeahead suggestions for the actor field in the movie filter
form (fixes #188, fixes #190)

Turns out we could just use the existing cache mechanism for this, no
need for a complicated background job
make the size parameter optional when constructing thumbnails and add
a setter so that it can be changed later
create and use an interface for items that should be renderable in a
typeahead suggestion box
make it possible to filter TV shows by artist too
display movie director (only the first credited) on the movie details
page
some cleanup of the HTML and LESS around the rating and metadata
add ability to filter by director (fixes #187)