* ci: cleanup up test app directories
* ci: use electron prefix for a testing apps so that the can be cleaned up
* Revert "ci: cleanup up test app directories"
This reverts commit a47daba812ee95f506cac0f1bfedda8be7b4e2f0.
* fixup test due to app name change
* docs: add references to app.whenReady() in isReady
* refactor: prefer app.whenReady()
In the docs, specs, and lib, replace instances of `app.once('ready')`
(seen occasionally) and `app.on('ready')` (extremely common) with
`app.whenReady()`.
It's better to encourage users to use whenReady():
1. it handles the edge case of registering for 'ready' after it's fired
2. it avoids the minor wart of leaving an active listener alive for
an event that wll never fire again
