* [Dist] deprecate etype and always use canonical etype for partition and load
* enable canonical etypes in dist part pipeline
* resolve rebase conflicts
* fix lint
* fix test failure
* throw exception if outdated part config is loaded
* refine
* refine
* revert unnecessary change
* fix typo
* Implement range based NDArrayPartition
* Finish implement range based partition support
* Add unit test
* Fix whitepace
* Add Kernel suffix
* Fix argument passing
* Add doxygen docs and improve variable naming
* Add unit test
* Add function for converting a partition book
* Add example to partition_op docs
* Fix dtype conversion for mxnet and tensorflow
Rhett Ying