* change plasma object notifications to carry a struct of information
* factoring out object_info for general use by several Ray components
* fixing a bug in python test
* addressing comments
* handling Robert's comments
* clang format
* Fix valgrind.
* Bring back fetch tests.
* Zero initialize success array in PyPlasma_fetch.
* Fix bug in fetch in case where the object ID doesn't have any managers in the object table.
* Temporarily disallow calling fetch with multiple copies of the same object ID.
* Fix.
* Factor out code for checking if list of object IDs are all distinct.
* Remove commented out code.
* Fix.