Remove interactive mode from TemplateTask.

Instead of having an interactive mode, it should use the params provided
in the cli command like other bake features.

Add some verbose logging so people know what themes were found, and what
the active theme is.
Add test for error an improve error message.
Make the default theme the default :)
Merge pull request #3439 from cakephp/3.0-template-task

3.0 template task