Pygerduty

Fixed
- `incidents/{id}/{verb}` has been deprecated with v2 of the PagerDuty API. Fixed.

Added
- Tests for the new incidents behavior.

Added
- This CHANGELOG file.
- `FinalSchedule`, `RenderSchedule` containers added to provide more readable responses.

Removed
- `Entries` collection and `entries` attribute from `Schedule` from v2 module as they're not supported in the v2 API.

Changed
- `Events` class now has a default `Requester` to improve ergonomics.

Added
- Forked __init__.py into new v2, common, events modules. These are meant to support the v2 REST API without breaking existing users of pygerduty.
- Lots of tests for v2 module.
- Usage of v2 library to README
- Overview of modules to README

Changed
- Moved inline json into fixture files to clean up unit tests.

Fixed
- setup.py test integrations to properly fail on Travis CI.