Support index.count()

[lpschz]

Not sure if it's added in the features to add in the new release, but would be a nice to have as well!

[lpschz]

Actually I meant something like index.count(IDBKeyRange), would be a nice abstraction to have! Maybe a plugin?

[alekseykulikov]

It's the part of new release #29. Most of the methods will be able to accept optional range:

index.count([range])
index.getAll([range])
store.count([range])
store.getAll([range])

The main problem now, that I have to pass all this features in indexeddbshim env... which is hard :)