Remove unused bulky handles property

This was passed to the client in subscribe(); it's never used anywhere
and just wastes bandwidth
Don't create extra arrays

Replace concat() with push.apply() to append to arrays in-place (where
possible)
Fix handles for Store.fetch()

(While removing unused bulky handles property elsewhere)
This modifies commit 26c5dfe030a88aefbf777453d4acb7522d313dba.
Add Windows test runner

Does not use make
Correct parameter name in RefListener
Add Model#onPath()

Loop-light event binding