BatchSender: upping limit for good browsers

It finally happens...

SDPI sends a lot of metrics, and only fitting about one event per batch is harming performance. This change will increase to about 10 events per batch.

IE will still suffer, as usual.
My understanding is that the idea with bower is to pull down a library ready to use (no compiling/minifying required), so it needs to have at least the .min.js file and maybe the other one if you want to support debugging.

Some projects with heavyweight repos actually split the bower package from the normal repo, so the bower one is just for usage and not development (eg https://github.com/highslide-software/highcharts.com/ vs https://github.com/highslide-software/highcharts-release).  I don't think clientmetrics is big enough to warrant it yet, but it's something we could consider in the future.