Bump raw stacktrace version

In order for #50 to work we need to actually bump the version of raw-stacktrace so we can use the new options. I also added some documentation, mainly so yall can tell me if I am using this right :)

Relevant PRs/Issues:
https://github.com/mattrobenolt/raven-node/pull/50
https://github.com/mattrobenolt/raven-node/issues/47