Sevenbridges-python

- Improvements:
- Added support for folders
- Added sorting for task queries

- Bugfixes:
- Fixed build issue

- Improvements:
- [Issue 104](https://github.com/sbg/sevenbridges-python/issues/104)
- Added support for dataset operations
- Bugfixes:
- [Issue 47](https://github.com/sbg/sevenbridges-python/issues/47)
- Fixed nested dictionary change detection

- Added support for bulk operations with files, imports and exports

- Bugfixes:
- Fix file serialization for input lists of greater depth

- Improvements:
- Make task batching toggleable with batch property

- Bugfixes:
- Fix `__get__` methods for None vales in CompoundField and CompoundFieldList