Passthrough with glob

Closes https://github.com/floatdrop/gulp-watch/issues/11
alternate conditional for opts.passThrough
right the first time
Not passThrough behaviour -- but something else (emitOnWatch)
opts.emitOnWatch to opts.emitOnGlob

Make it clear it’s related to glob option.
Allow watch with blob to act as passthrough -- currently break tests
Change the way to bootstrap gaze.

Passes all current tests
clean up [skip ci]
Emit ready event once
wording fix
Merge pull request #16 from Dashed/patch-1

Emit on watch with glob (re-titled)