Add the send environment option
Fix travis
Merge pull request #161 from bugsnag/160-env-tab

160 env tab
Update readme
Readme
tweak
Merge pull request #162 from bugsnag/notification-object

Document the notification object a little
Allow before_bugsnag_notify to see metadata
Fix tests
Merge pull request #163 from bugsnag/sidekiq-retry-count

Allow before_bugsnag_notify to see metadata
Update version
Use blockquotes to represent docs sidenotes
Send headers through
Merge pull request #168 from bugsnag/headers

Send headers through
Bump version
Update changelog
Support operating with metadata in ignore_errors block