Minor improvements to why-perl6/lightning-talk: more examples for huffmanized closures, a link to the repo copy of JSON::Tiny::Grammar, and a couple fixes to XXXX notes
make-presentations: Move HTML generation routines into DeckMaker class; remove overcomplex reveal-path() sub, add --watch option that activates FS update watching to automatically rebuild presentations whenever a file is saved; protect against running without concurrency support (needed by --watch implementation)