function findSection( nodes, name ) {
	var i;
	for ( i = 0; i < nodes.length; i++ ) {
		if ( nodes[ i ].title === name ) {
			return nodes[ i ];
		}
	}
	return null;
}
Returns a section AST node having a specified title.

@private
@param {ObjectArray} nodes - section AST nodes
@param {string} name - section name
@returns {(Object|null)} AST node or null