add a way to override the generated slugs
expand slugify to pull in a series of corrections

to pull in corrections specific to elections later
add a way to transform race and candidate slugs
check in some support files
redo slugify/correction arguments to remove ambiguity
extend slug corrections to interpret_county too
move bucket data type to utils b/c it's not really related to serialize_
get rid of dependency injection logic in serialize_statewide
update 'process' to take text to decouple it from files b/c files can suck sometimes
Merge pull request #2 from texastribune/slug-corrections

Add slug corrections