* [Serve] Added deadline awareness
Added deadline awareness while enqueuing a query
Using Blist sorted-list implementation (ascending order) to get queries according to their specified deadlines. [buffer_queues]
Exposed slo_ms via handle/http request
Added slo example
The queries in example will be executed in almost the opposite order of which they are fired
Added slo pytest
Added check for slo_ms to not be negative
Included the changes suggested
* Linting Corrections
* Adding the code changes suggested by format.sh
* Added the suggested changes
Added justification for blist
Added blist in travis/ci/install-dependencies.sh
* Fixed linting issues
* Added blist to ray/doc/requirements-doc.txt