First "public" release

Now that there is the beginnings of (awkward) persistence for user's work, it's worth "letting" others try it out. The interface is still terrible, and you can't yet add new puzzles, but at least there's a base for solving puzzles other than "all at one time."

Add rectangle puzzle support and CLI client

New functionality and fixes.

• (new) Add support for rectangular puzzles.
• (new) Add a command-line client.
• (fix) Core puzzle analysis was missing inconsistencies.

Urgent bug fix (#33) on v0.8

Bug #32 was causing crashes that were passed through to clients: a bad situation. So implemented enhancement #33 to keep the server from crashing on runtime failures.

First full-pipeline Heroku release

First release from feature branch to stage to production on Heroku. Functionality is still not where I want for a public release, so not publishing the production address yet.