remove book from chapter, add max-p in dirname

- move base_dir into speaker
give feedback if being asked to follow bad links
clean up speaker and put under test

- factories helper for chapter
- add speaker#verbose, rate, voice
add binder

- pull runner out into own class (mimics awesome_spawn)
- title_path, rename content to body_path and follow to link_path
- more spec coverage
- aborts if speaking command fails
clean up spec issues

- travis