Custom monitored resources

[zdunecki]

Currently, this lib doesn't allow to choose custom monitored resources. It's a useful feature to match the machine where do metrics come from.

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[zdunecki]

@googlebot I signed it!

[tam7t]

Thanks for the contribution, I have limited availability right now but hope to review on/by 8 January.

[zdunecki]

@tam7t, thanks for CR and tips. I guess I resolved all.

[tam7t]

Thanks, I'll try to cut a v0.3.0 release with this in it, but I'm going to try doing some manual integration testing first but in the meantime i think you should be able to do like:

go get github.com/google/go-metrics-stackdriver@12f414d48a0fbe8802005bc082c6a9345e9c5e12