Added support for matching subscription arguments
I need to make a couple of breaking API changes to fix the next set of bugs, so I'm separating the latest changes in a v1.1.x branch. The next release should be v2.0.0, unless I need to make any bug fixes in v1.x.x before then.
The new feature that bumped this up from the v1.0.x series is support for subscription arguments and filters based on those arguments. I also fixed a couple of bugs in response::Value
which didn't require breaking changes to the API.