remove libuv and using asyncdispatch

[2vg]

No description provided.

[sclee15]

I think this is a good choice if the speed is not compromised.

[2vg]

@sclee15 Speed decreases when I use asyncdispatch.

As for this, asyncdispatch has a problem, and the Selectors module does not matter.

Selectors module is refined very much and offers a splendid event loop. (probably, from my benchmark result, it is the speed that is about the same as libev.)

So I will close this Issue if asyncdispatch is improved.(mean it that is that I replace it with asyncdispatch from libuv.)

[2vg]

libuv faster than asyncdispatch yet now.

[2vg]

The reason why the asyncdispatch benchmark is low was due to the reduced number of wrk requests.
I need to do a proper benchmark, but I will immediately create the same web server using asyncdispatch.

[2vg]

As a result of benchmark, I think that probably I continue developing it in asyncdispatch.

[sclee15]

Awesome