One-off loader classes

[ghing]

A number of states, such as Washington, have dramatically different file structures that vary from election to election and county to county for precinct-level results. We should think of a way to organize and publicize the need to implement these. In many ways these are an easy, atomic way for a volunteer to plug in since they only have to review and understand a single file rather than an entire state's, or election's worth. Also, some utility functions or base classes for dealing with the state will already have been written.

[dwillis]

@zstumgoren, I think this is the way to go forward for the short-term: to identify small, election-specific code contributions in loader classes for states, and publicize them. Let's discuss.