adding more benchmarking code
Identified issue with local convergence.  It appears pretty essential that the local solver solve the local objective.
tuning async admm
Merge branch 'admm-emerson' of https://github.com/jegonzal/spark into admm-emerson
Merge remote-tracking branch 'origin/admm-emerson-wip' into admm-emerson
sort of fixing asynchronous version.