Publishing updates with biddle broken

[prettydiff]

Problems:

• https://github.com/prettydiff/biddle/issues/20
• index.html not generated
• publications directory included in zip files
• there are no unit tests for publishing updates

Observations:

• publish.json is updated correctly

[prettydiff]

Fixed with #20.

[prettydiff]

Executing PowerShell tasks on Windows through Node's child process is challenging to predict.

It appears that executing powershell command through the standard windows command shell is asynchronous much like executing Node. It appears powershell synchronously creates a shell to execute its commands asynchronously from the primary windows shell. Node is aware of when its child processes and its primary windows shell complete, but has no way of knowing when other shells complete their tasks particularly if they are also asynchronous.

The publish task uses the zip command internally, which in Windows means running a powershell task to execute 7zip. Currently its a guess when the task completes. The more zip files there are to create and the larger those files become the more inaccurate the guess becomes. The problem is that a Node callback for this task will either fire too early or never at all.