logging errors in development and test environments instead of posting them to airbrake
better solution that allows customizing dev environments
defaulting to 0 development environments (user has to specify), updating tests
Update readme to reflect developmentEnvironments option.
Disable failing test

Airbrake seems to retrun statusCode === 200 for bad API keys now. The
response body is:

You have accessed a deleted account.

or

Your account is being provisioned or no longer active.
Fix malformed XML for Errors without message

This seems to be a bug in the XML builder library, and for now I'm
adressing it with this workaround.

Closes #15
0.2.5
Update endpoint to api.airbrake.io
Merge pull request #17 from gary-rafferty/master

Endpoint has changed to api.airbrake.io
0.2.6
Fix API links in Readme

airbrakeapp.com => airbrake.io
Merge pull request #18 from stefounet/master

Fix API links in Readme
Re-enable and fix invalid-api-key test

See 5939fea31b7809ca32ab4f28d35ff17ef619b486
0.2.7
updated package.json to use never version of request, as request-1.9.8 globally leaked 'i'

Fixes #19
0.2.8
Merge pull request #14 from robscott/master

Environment specific airbrake notifications
0.2.9
Add express error handler
Add a dieOnError option that defaults to true