Remove flying-saucer dependencies (CSS) as we're using JavaFX now.
Display request body POSTed to /display. Add posth.sh to ease testing.
Add CORS support so clients can POST to casti from other domains.
Merge branch 'feature/display-command'. Accepts POST HTML; accepts CORS if run
with the CORS domain as the first argument (e.g. castiapp.com, defaults to
localhost).