Fix error message
Fix RSpec deprecation warnings
Fix more RSpec deprecations
Switch to byebug
Integrate the Skylight native agent

In an effort to reduce the CPU and memory overhead of the Skylight
agent, the bulk of it has been re-written in Rust.
Fix net/http probe
Bump native agent
Lock rspec to >2
Remove unused Trace#spans reader
Fix the Trace#endpoint reader
Bump the native agent
Fix typo
Use the correct ENV var
Fix the Rakefile
Remove UTF-8 chars from Config
Handle Instrumenter.start! failures
Cleanup the build process
Remove pry (not supported on 1.9)
Bump native agent version
Set a good example in the dummy app config

https://github.com/skylightio/skylight-ruby/issues/16