Raise exception on failure to deliver hipchat message.
Fix hipchat tests

- don't need to use faraday stubs anymore b/c we're using the hipchat
  gem
Add test to ensure an exception is thrown if !response.success?
Merge pull request #65 from librato/fix/raise_hipchat_errors

Raise exception on failure to deliver hipchat message.
Version bump to 2.6.0
Regenerate gemspec for version 2.6.0
Support a 'clear' bool flag in the payload

- if a service supports clearing then receive_alert_clear will be called
Merge pull request #66 from librato/feature/clear-payload-support

Support a 'clear' bool flag in the payload
Log connection failures for webhooks instead of raising errors
log payload on webhook failure
Merge pull request #67 from librato/feature/webhook-log-invalid-url

Log connection failures for webhooks instead of raising errors
Version bump to 2.7.0
Regenerate gemspec for version 2.7.0
Add Slack snapshots