Pyxnat

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- Docker-based tests are temporarily removed from Travis
- Tests are now included with the PyPI package

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* New Features

- CI tests can be skipped if no network connectivity or no Docker-based XNAT available
- bin/sessionmirror.py: migrate an experiment between two XNAT instances

* Improvements

- More tests
- Refreshing documentation

* Bug fixes

- XNAT REST API compatibility (`Interfaces.version()`, `Schemas`, etc)
- Removed deprecated references to cache support
- Python 3 fixes

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* Improvements

- Refreshing documentation

* Bug fixes

- If verify not defined, don't store it
- Closing requests session on disconnection

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* New Features

- Python 3 compatibility

* Improvements

- Get aliases from a project
- CI tests may now (partially) run within a Docker container
- `ArrayData` class makes no more assumption on data type and use broader/generic types (avoids missing results from other types)
- Specific methods added for MRSessions and MRScans
- Added certification verification to configuration file
- Added test coverage

* Bug fixes

- CI tests run again (partially)
- Fixed vulnerability (upgraded `requests` package version)
- Replaced '\n' newline chars by an OS-agnostic alternative

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* New Features

* Improvements
- Pass keyword arguments on some put/create methods, to allow passing event_reason.

* Bug fixes
- Minor docs inconsistencies that generated sphinx warnings
- Clean up deprecated references in sphinx autogenerate extension
- Remove deprecated sphinx plugin pngmath in favor of imgmath

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* New Features
- Convenience methods on interface: get, put, post, delete, head
- Verify option on interface for ssl-cert-verification

* Improvements
- More useful error messages when things go wrong
- streaming file upload
- streaming file download
- Use the requests library instead of httplib2 for REST calls

* Bug fixes
- Removed custom httplib2 caching.