function fetchFile( filepath, repos, clbk ) {
	factory( filepath, repos, clbk )();
}
Fetches a file from one or more repositories.

@param {string} filepath - relative filepath of the file to fetch
@param {StringArray} repos - array of repo slugs indicating the repositories from which to fetch a file
@param {Function} clbk - callback to invoke upon query completion
@returns {void}