* concurrent echo client for stress testing
* update examples for benchmarking, tweak cabal file
* mark frequently-used call as unsafe for performance boost
* add unsafe annotation to non-blocking C calls on critical path
* more unsafe annotations -- server performance almost doubled now
* one CQ for all call ops
* unsafe annotation on start_batch
* wait for all client threads, replace error with fail
* add -O2
* remove parent ptr from unregistered calls -- unneeded
* begin unregistered high level server loop
* undo changes to highlevel server, add mkConfig for unregistered server
* move call CQ create/destroy into call create/destroy
* async normal call function
* preliminary unregistered server loop for non-streaming methods
* working unregistered highlevel example
* loop counters for benchmarking
* changes for benchmarking, add ruby example server for benchmarking
* async version of withCall, refactor unregistered server loop to handle all method types
* unregistered client streaming
* add remaining streaming modes
* unregistered server streaming test
* unregistered streaming tests
* add error logging
* fix bug in add example
* remove old TODOs
* fix bug: don't assume slices are null-terminated
* add TODO re: unregistered client streaming functions
* initial echo client/server examples
* registered and unregistered versions of the example client
* ignore pyc files
* cpp echo code, flag to build examples
* threaded server example
