Allow meghanada to support hooks after a test is executed

[roman]

Hey @mopemope

Just wanted to thank you for this package, is great, makes Java development experience somewhat bearable.

I'm adding a functionality to allow interested packages to get notified when a JUnit test-suite finishes. Following is an example of what kind of stuff I do with this hook on my personal setup.

Notice the highlights of the mode-line whenever a test starts executing, a green highlight when it passes and a red highlight when it doesn't.

Thank you for considering this pull request.

[roman]

Also, I think this hook may be improved by adding the test counts (success, failure, ignored) as parameters for the hook. Given that we control the format of the JUnit buffer, we can reliably get the numbers from the buffer before calling running the hooks. What are your thoughts?

[roman]

@mopemope is this project no longer maintained?

[mopemope]

@roman Sorry I'm here. I also think that customizing hooks is a good idea.

[mopemope]

@roman Merged. Thanks !