LICENSE: Apache License 2.0

I hesitated somewhat between Apache (non-copyleft) and GPLv3 (copyleft)
here.  But eventually, I believe it is best to start with more
permissive licence and ideally leave the *framework* that shall evolve
from this under the permissive licence, as it is more of a technical
exercise than anything innovative and really, Noone Should Have To Do
That Work Again - my personal razor for licence decisions.

If we manage to bring non-trivial algorithms and such into YodaQA,
we may reconsider whether not to relicense the appropriate pipeline
components to GPLv3; anyone can always do that thanks to licence
compatibility.  But there is ample time for that at this point.
HIGHLEVEL: Mention that some phases are 'IO phases'
A rudimental YodaQAApp with interactive io and AnswerRanker AE

This implements an interactive question reader and answer writer,
type system for FinalAnswerCAS, a dummy AnswerRanker analysis
engine (that just generates an Answer FS straight from the artifact)
and a simple aggregate AE + application wrapper around this all.

In other words, we can now read lines from input and echo them back
to the output. ;-)

This provides the required scaffolding and minimal functionality for
adding the rest of the pipeline and then some real AEs.