at some point we should probably change this so that twitter.properties lives within the "config" directory of this module

but in general for any module, we could support this based on naming convention, where it looks in the local config else falls back to a <modulename>.properties in the global config dir (or for this case and others like it, maybe we need to rename to twitter-search.properties and let the convention first check the full name, then fallback next to the name preceding the hyphen).