pydata / xarray / 4153

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WIP: Zarr backend (#1528)

* added HiddenKeyDict class

* new zarr backend

* added HiddenKeyDict class

* new zarr backend

* add zarr to ci reqs

* add zarr api to docs

* some zarr tests passing

* requires zarr decorator

* wip

* added chunking test

* remove debuggin statements

* fixed HiddenKeyDict

* added HiddenKeyDict class

* new zarr backend

* add zarr to ci reqs

* add zarr api to docs

* some zarr tests passing

* requires zarr decorator

* wip

* added chunking test

* remove debuggin statements

* fixed HiddenKeyDict

* wip

* finished merge

* create opener object

* trying to get caching working

* caching still not working

* updating zarr backend with new indexing mixins

* added new zarr dev test env

* update travis

* move zarr-dev to travis allowed failures

* fix typo in env file

* wip

* fixed zarr auto_chunk

* refactored zarr tests

* new encoding test

* cleanup and buildout ZarrArrayWrapper, vectorized indexing

* more wip

* very close to passing all tests

* modified inheritance

* subclass AbstractWriteableDataStore

* xfailed certain tests

* pr comments wip

* removed autoclose

* new test for chunk encoding

* added another test

* tests for HiddenKeyDict

* flake8

* zarr version update

* added more tests

* added compressor test

* docs

* weird ascii character issue

* doc fixes

* what's new

* more file encoding nightmares

* Tests for backends.zarr._replace_slices_with_arrays

(and misc. small cleanup, adding docstrings + a bit more validation logic)

* respond to @shoyer's review

* final fixes

* put back @shoyer's original max function

* another try with 2.7-safe max function

* put back @shoyer's original max function

* bypass lock on ArrayWriter

* eliminate read mode

* added zarr distributed integration test

* fixed max bug

* change lock to False

* fix doc typos

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8329 of 8800 relevant lines covered (94.65%)

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