Remove Campfire hook from .travis.yml
Remove annotations from native ext
Update native extension
Add EWMA and Meter classes
Instrument and report internal agent metrics
Merge pull request #118 from tildeio/metrics

Aggregate internal metrics in standalone agent and report to rails app
Send more information with exceptions
Merge pull request #141 from tildeio/better-exception-reports

Send more information with exceptions
Rake task for updating vendored highline
Update vendored highline to 1.6.21