Cloud-files

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* test: expand compression test
* chore: add brotli as a dependency
* docs: fix typo in transfer docs, upload changelog

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* chore: upgrade google storage to 1.30.0
* docs: mention high efficiency transfers
* docs: remove caveat from brotli support
* test: ensure transfer\_to works with strings
* test: show transfer\_from works
* feat: allow transfer\_to/transfer\_from to accept cloudpaths
* perf: skip compress/decompress cycle during transfers (12)
* feat: support for brotli on GCS (11)
* chore: update changelog

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* fix: ensure desc is a string
* fix: typo where paths should be total
* chore: update changelog

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* fix: accept py27 str and unicode types

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* fix: handling generators for exists properly

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* fix: make numpy optional and print warning message if its not installed
* fix: import error for numpy in JSON decoder
* docs: remove reference to BOSS from secrets