* Optimizations:
- Track mapping of missing object to dependent tasks to avoid iterating over task queue
- Perform all fetch requests for missing objects using the same timer
* Fix bug and add regression test
* Record task dependencies and active fetch requests in the same hash table
* fix typo
* Fix memory leak and add test cases for scheduling when dependencies are evicted
* Fix python3 test case
* Minor details.
* Change plasma_get to take a timeout and an array of object IDs.
* Address comments.
* Bug fix related to computing object hashes.
* Add test.
* Fix file descriptor leak.
* Fix valgrind.
* Formatting.
* Remove call to plasma_contains from the plasma client. Use timeout internally in ray.get.
* small fixes
* Split local scheduler task queue into waiting and dispatch queue
* Fix memory leak
* Add a new task scheduling status for when a task has been queued locally
* Fix global scheduler test case and add task status doc
* Documentation
* Address Philipp's comments
* Move tasks back to the waiting queue if their dependencies become unavailable
* Update existing task table entries instead of overwriting
* Prevent plasma store and manager from dying when a worker dies.
* Check errno inside of warn_if_sigpipe. Passing in errno doesn't work because the arguments to warn_if_sigpipe can be evaluated out of order.
* Remove start_ray_local from ray.init and change default number of workers to 10.
* Remove alexnet example.
* Move array methods to experimental.
* Remove TRPO example.
* Remove old files.
* Compile plasma when we build numbuf.
* Address comments.
* Updated code to mesh with get_weights returning a dict and new tf code
* Added tf.global_variables_initalizer to hyperopt example as well
* Small fix.
* Small name change.
* Added helper class for getting tf variables from loss function
* Updated usage and documentation
* Removed try-catches
* Added futures
* Added documentation
* fixes and tests
* more tests
* install tensorflow in travis
* check available shared memory when starting object store
* exit with error if not enough shared memory available for object store
* Some comments and formatting.
* Object notification test for Photon, and turn on valgrind for Photon C tests
* Test object notification handler in the plasma manager
* Fix hanging test case
* Improve formatting of error messages.
* Catch errors that occur when looking up function name from function ID.
* Push warning to user if worker spends to long waiting for proper import counter.
* Fixes.
* Add comment.
* Send message from plasma client to get plasma store capacity.
* Release objects from plasma client if they are too large.
* Use doubly-linked list instead of ring buffer for plasma client release history.
* Address comments.
* Fix problem with slicing PlasmaBuffer objects.
* Fix crash in plasma manager during transfer.
* Formatting.
* Make plasma client cache larger and make caching test not throw exceptions on Travis.
