Task observer for aster.
This module is part of aster and is available via aster.runner.
You use it in build scripts whenever you want build pipeline (which is lazy by default) to be executed:
var aster = require('aster');
aster.src('src/**/*.js')
.map(plugin1(optionsForPlugin1))
.map(plugin2(optionsForPlugin2))
// ...
.subscribe(aster.runner);Type: Rx.Observer