Popoto

What's Changed
* partitioning for SortedField - tomcounsell in https://github.com/tomcounsell/popoto/pull/20
* fix docs on sort_by - tomcounsell in https://github.com/tomcounsell/popoto/pull/21
* enable and test _isnull query filter by tomcounsell in https://github.com/tomcounsell/popoto/pull/22
* new DataFrameField and improve decoder performance by tomcounsell in https://github.com/tomcounsell/popoto/pull/28


**Full Changelog**: https://github.com/tomcounsell/popoto/compare/v0.8.0...v0.8.3

What's Changed
* Order query results with new `order_by` parameter
* Specify values returned in a query. Allows some queries to see large performance improvements.


PRs
* Query order by by tomcounsell in https://github.com/tomcounsell/popoto/pull/15
* Query values by tomcounsell in https://github.com/tomcounsell/popoto/pull/19


**Full Changelog**: https://github.com/tomcounsell/popoto/compare/0.7.0...0.8.0

Beta version of relationship fields now generally available. Please report bugs to [github.com/tomcounsell/popoto/issues](https://github.com/tomcounsell/popoto/issues)

What's Changed
* new Relationship Field by tomcounsell in https://github.com/tomcounsell/popoto/pull/13


**Full Changelog**: https://github.com/tomcounsell/popoto/compare/0.6.0...0.7.0

* GeoField and improved key management by tomcounsell in https://github.com/tomcounsell/popoto/pull/3
* SortedField for numerical sorts by tomcounsell in https://github.com/tomcounsell/popoto/pull/4
* keyfield sets by tomcounsell in https://github.com/tomcounsell/popoto/pull/8
* query count by tomcounsell in https://github.com/tomcounsell/popoto/pull/9
* partitioned sorted sets for timeseries model by tomcounsell in https://github.com/tomcounsell/popoto/pull/10
* Fields syntax refactor by tomcounsell in https://github.com/tomcounsell/popoto/pull/11

**Full Changelog**: https://github.com/tomcounsell/popoto/commits/0.6.0