Update Heal Block to XY
It now disables damaging moves with draining capabilities.
Effect Spore checks for Powder immunity
Fix style errors; update gulpfile

I used a hack to make the multiple declaration errors go away,
so all that remained in jsHint were actual errors, which I've
now mostly fixed.

All this linting ended up uncovering one actual bug: Uproar's
message not showing. It's a very minor bug in a move no one uses,
so I'm going to fold it into this commit.
More style fixes and Gulpfile updates

JSHint is now a fair bit stricter, and is now correctly checking
files in `mods/`.

The code has been fixed to match the new stricter standards.

JSHint has now caught its second actual bug: Gen 5 Pinap Berry
was Ice instead of Grass.
Support `npm test`

Also made linting synchronous, which makes Gulp's output look
slightly nicer (and time it, which is cool).
Updates