闲的无聊写的一个bigpipe的template engine

https://www.npmjs.com/package/btljs

html的格式可以方便的扩展异步执行（每解析一个tag都直接stream输出）

##Description

This is a template language aimed for bigpipe with async support

Template is parsed line by line.

No more messed-up&splitted-everywhere modules needed.

Write bigpipe in pure html

##Example

###Template

    <html>
        <head>
            <title>Hello World</title>
        </head>
        <body>
            <for start='0' end='10' step='+2' iterator='j'>
                <script wait>
                    this.j++;
                    setTimeout(this.fulfill,2000) //2000ms
                </script>
                <p> Aloha!!!!</p>
            </for>  
        </body>
    </html>

###NodeJs

    var koa     = require('koa');
    var fs      = require('fs');
    var Parser  = require('./lib/parser');
    var co      = require('co');
    var app     = koa();
    var html    = fs.readFileSync('you file');

    var parser  = Parser();

    co(function*() {
        yield parser.load(html);
        app.use(function* () {
            this.type = 'html';
            this.body = parser.stream();
        });
    });
    
    app.listen(3000);

##Customization

###Add custom tag


parser.addTag('MyTag',function* (ele,push,context) {
    push('<p>This is a test tag</p>');
});