Fixes several bugs and cleans up dependencies.

This is the initial release, it features basic methods and no documentation yet.

You can set a provider with

Oeffi.configure do |oeffi|
  oeffi.provider = :vbb
end

and then use the following methods for querying:

• Oeffi::queryTrips - this will fetch you several trips based on locations given
• Oeffi::autocomplete - this will suggest Locations to you based on a name given