Siphon

The core of this release consists of API improvements to simplify common tasks:
* The datasets and catalog references can now be grabbed from their collections by position (index) (as well as by name).
* Collections of datasets and catalog references now have helper functions that allow extracting a time range or item closest to a time, assuming the entries have appropriately formatted times in the names.
* Datasets gained functions that simplify setting up access over various TDS services
* A catalog with a latest dataset now has a `latest` attribute that points directly to this dataset

Issues Closed

* [Issue 136](https://github.com/unidata/siphon/issues/136) - Simplify access to download services
* [Issue 135](https://github.com/unidata/siphon/issues/135) - Add datetime filtering of datasets
* [Issue 134](https://github.com/unidata/siphon/issues/134) - Improved dataset indexing
* [Issue 102](https://github.com/unidata/siphon/issues/102) - NCSS validate_query with no variables
* [Issue 83](https://github.com/unidata/siphon/issues/83) - API warts

In this release 5 issues were closed.

Pull Requests Merged

* [PR 143](https://github.com/unidata/siphon/pull/143) - BUG: Fix empty set returned from validate_query (Fixes 102)
* [PR 140](https://github.com/unidata/siphon/pull/140) - Improve API
* [PR 132](https://github.com/unidata/siphon/pull/132) - DOCFIX: Added info about using 'all'
* [PR 129](https://github.com/unidata/siphon/pull/129) - Fix build
* [PR 127](https://github.com/unidata/siphon/pull/127) - Handle more data types when parsing dataset.xml

In this release 5 pull requests were closed.

- Make catalog parsing more permissive
- Handle catalogs from non-standard server context
- Handle catalogs from Hyrax servers

Contributors to this release

joelrahman, lesserwhirls, dopplershift

Issues Closed

* [Issue 115](https://github.com/Unidata/siphon/issues/115) - <access> element
* [Issue 114](https://github.com/Unidata/siphon/issues/114) - TDSCatalog has no datasets
* [Issue 91](https://github.com/Unidata/siphon/issues/91) - Updates for docs/examples
* [Issue 88](https://github.com/Unidata/siphon/issues/88) - Move some docs to markdown

Pull Requests Merged

* [PR 124](https://github.com/Unidata/siphon/pull/124) - Fix validation warning in tests
* [PR 123](https://github.com/Unidata/siphon/pull/123) - Modernize infrastructure
* [PR 122](https://github.com/Unidata/siphon/pull/122) - Process dataset elements with access children
* [PR 118](https://github.com/Unidata/siphon/pull/118) - Latest dataset issue
* [PR 113](https://github.com/Unidata/siphon/pull/113) - BUG: Make parsing more permissive.
* [PR 108](https://github.com/Unidata/siphon/pull/108) - Fix for accessing THREDDS catalogs hosted at a other Context Path

Other Changes
- Documentation now hosted at https://unidata.github.io/siphon
- Examples stored in repository as scripts, but can be downloaded from built examples as notebooks (thanks to sphinx-gallery)

- Lots of work on CDMRemote support
- Fixes for netCDF extended model
- TDS 5.0 compatibility
- Beginning support for TDS 5.0 CDMRemoteFeature
- nose -> py.test
- Made catalog warnings less verbose by default
- `TDSCatalog` now uses `OrderedDict` for catalog references and datasets. This makes the order of the items in these collections match that of the original catalog.
- Experimental integration between CDMRemote support and xarray

- Fix `lonlat_box` query function parameter order to match name (API change, 48)
- Fix tempfile handling for NCSS on windows (24)
- Improve error messages on HTTP errors (65)

- Handle radarserver metadata 27 46 37
- Simplify following `CatalogRef` urls 35
- Warn and try xml link in `TDSCatalog` if passed HTML link 32
- Add info for conda development environment 41
- Be less pedantic in validating catalogs 28