code: function flatten( sections ) {
  	var out,
  		key,
  		i;
  
  	out = {};
  	for ( i = 0; i < sections.length; i++ ) {
  		key = 'section:' + sections[ i ].replace( /\./, ':' );
  		out[ key ] = true;
  	}
  	return out;
  }
docs: FUNCTION: flatten( sections )
  Flattens a `sections` array.
  
  @param {String[]} sections - sections
  @returns {Object} flattened sections