getFilesFromZip(handler, directory) {
        const globPattern = this.getExtensionGlob(handler.extensions, ALL_DIRS);
        return _.map(glob.sync(globPattern, {cwd: directory, nocase: true}), function (file) {
            return {name: file, path: path.join(directory, file)};
        });
    }
Use the handler extensions to get a globbing pattern, then use that to fetch all the files from the zip which
are relevant to the given handler, and return them as a name and path combo
@param {Object} handler
@param {String} directory
@returns {File[]} Files