Version 1.2.4 release

Version 1.2.3 release

Version 1.2.2 release

faster compute call, cached find_necessary_steps, fixed multithreadin…

…g bug

Merge pull request #9 from yahoo/thread_pool_barrier_executor

Thread pool barrier executor

Update setup.py

Merge pull request #7 from simaoh/timing

fixing reinitialization of times dictionary for different calls of pi…

Merge pull request #6 from yahoo/plot-optional

make plotting dependencies optional

Merge pull request #5 from yahoo/remove-packaging-dep

Remove 'packaging' as dependency

Merge pull request #4 from robwhess/fix-deleting-optionals

Fix DeleteInstruction processing for optional needs