* Fix errcheck and golint warnings
* Remove unused constants and fix comments
* Parse error responses properly
* Fix Open with RangeOption
* Fix Move, Copy and DirMove
* Implement DirCacheFlush
* Check interfaces are correct
* Remove debugs and update overview
* Correct feature flags
* Pare replacement characters down to the minimum set
* Add to the integration tests
Google cloud storage doesn't normally need retries, however certain
things (eg bucket creation and removal) are rate limited and do
generate 429 errors.
Before this change the integration tests would regularly blow up with
errors from GCS rate limiting bucket creation and removal.
After this change we low level retry all operations using the same
exponential backoff strategy as used in the google drive backend.
The purpose of this is to make it easier to maintain and eventually to
allow the rclone backends to be re-used in other projects without
having to use the rclone configuration system.
The new code layout is documented in CONTRIBUTING.
