Implement event executer

[7k8m]

Thinking server like use of json.filed and idea of event executer.

What is difficult for event executer is that file is not fixed before event is fired.
This difficulty affects collect executer and roots executer.

[7k8m]

Now .exec function start root executer once.
Event executer is likely to be executed multiple times as events are fired.

[7k8m]

Difference between file and event.

File can be changed but fixed on file system in any way but event is not fixed at all.
Event happen at any time and many times.

If thinking event as a file, it is dynamically generated file.

[7k8m]

The difference would be some how similar to stream of socket and that of file ...

[7k8m]

I think found some answer...
There would be event to receive and event to end receiving...

[7k8m]

commit da33e18
Author: Tomohito Nakayama tmnk@nysalor.local
Date: Fri Mar 18 23:55:16 2016 +0900

testAll passes

commit 0bda57d
Author: Tomohito Nakayama tmnk@nysalor.local
Date: Fri Mar 18 23:52:08 2016 +0900

newly added testEvent.js passes

commit d65e8fd
Author: Tomohito Nakayama tmnk@nysalor.local
Date: Fri Mar 18 23:14:42 2016 +0900

event executer implemented and pass existing tests

commit 497f58b
Author: Tomohito Nakayama tmnk@nysalor.local
Date: Fri Mar 18 22:34:12 2016 +0900

introduce rootPlan and test passes

commit c42e7b9
Author: Tomohito Nakayama tmnk@nysalor.local
Date: Fri Mar 18 19:13:51 2016 +0900

Introduce rootExecuter class