Tubemaps 介绍
Tubemaps 是一个 Node.js 应用，给出一个数据集，将以管道的形式进行展示。
示例代码：
var TubeMap = require('tubemaps').TubeMap;
var london = new TubeMap({
stations: csv.stations,
lines: csv.lines,
connections: csv.connections
});
// Find @R_227_4045@ion about a station
var victoriaStation = london.getStationByName('Victoria');
// {conns:[{display_name: "Euston"}, ...], ..}
// Find @R_227_4045@ion a line
var victoriaLine = london.getLineByName('Victoria Line');
// [station1, station2,..]
// Find all connections in a line
var conns = london.line(victoriaLine)
// [{station1: #euston, station2: #warrentStreet}]
// Find path between two stations
var conns = london.path(euston, victoria)
// [{station1: #euston, station2: #warrentStreet, line: #victoriaLine}]
// Find path between two stations in a line
var conns = london.path(euston, victoria, line)
// [{station1: #euston, station2: #warrentStreet, line: #victoriaLine}]
