Merge pull request #4 from GameAnalytics/daemon-config-env-vars

Get X-Ray daemon address and port from environment variables

Merge pull request #3 from GameAnalytics/more-metadata

Add "origin" and "user" segment metadata

Handle extra error info properly (#2)

The "extra info" stack trace element is not guaranteed to contain file
and line, and it's not guaranteed to be in that order.  Let's handle
it properly by using Keyword.fetch.

Fix stacktrace encoding (#1)

Handle the case where the stack trace contains a list of arguments
instead of an integer arity.

Encode path as a binary instead of a charlist.

Also export the to_map function, so we can encode stack traces
gathered otherwise than from process info.

Handle non-string header names in AwsExRay.Util.get_header/3

The header names might be atoms. Don't crash in that case.