Datacube

- Fixes to package dependencies. No code changes.

- Minor features backported from 2.0:

- Support for `limit` in searches

- Alternative lazy search method `find_lazy`

- Fixes:

- Improve native field descriptions

- Connection should not be held open between multi-product searches

- Disable prefetch for celery workers

- Support jsonify-ing decimals

- Use `cloudpickle` as the `celery` serialiser

- Allow `celery` tests to run without installing it

- Move `datacube-worker` inside the main datacube package

- Write `metadata_type` from the ingest configuration if available

- Support config parsing limitations of Python 2

- Fix 303: resolve GDAL build dependencies on Travis

- Upgrade `rasterio` to newer version

New Features

- Support for AWS S3 array storage
- Driver Manager support for NetCDF, S3, S3-file drivers.


Usability Improvements

- When `datacube dataset add` is unable to add a Dataset to the index, print
out the entire Dataset to make it easier to debug the problem.
- Give `datacube system check` prettier and more readable output.
- Make `celery` and `redis` optional when installing.
- Significantly reduced disk space usage for integration tests
- `Dataset` objects now have an `is_active` field to mirror `is_archived`.
- Added `index.datasets.get_archived_location_times()` to see when each
location was archived.

Bug Fixes

- Fix bug when reading data in native projection, but outside `source` area. Often hit when running `datacube-stats`
- Fix error loading and fusing data using `dask`. (Fixes 276)
- When reading data, implement `skip_broken_datasets` for the `dask` case too
- Fix bug 261. Unable to load Australian Rainfall Grid Data. This was as a
result of the CRS/Transformation override functionality being broken when
using the latest `rasterio` version `1.0a9`

- Support for reading multiband HDF datasets, such as MODIS collection 6

- Workaround for rasterio issue when reprojecting stacked data

- Bug fixes for command line arg handling

- Adds more convenient year/date range search expressions (see 226)
- Adds a simple replication utility (see 223)
- Fixed issue reading products without embedded CRS info, such as bom_rainfall_grid (see 224)
- Fixed issues with stacking and ncml creation for NetCDF files
- Various documentation and bug fixes
- Added CircleCI as a continuous build system, for previewing generated documenation on pull
- Require xarray >= 0.9. Solves common problems caused by losing embedded flag_def and crs attributes.