Add some bits to the changelog for amqp removal work
### Security
- backend/gce: remove service account from booted instances
+### Added
+- HTTP queue type, including implementations of `JobQueue`, `Job`, and
+ `LogWriter`
+
+### Changed
+- build script generator accepts `Job` instead of `*simplejson.Json`
+
## [2.6.1] - 2017-01-23
### Fixed
- processor: open log writer early, prevent panic
