Support on_exit for registering callbacks in ExUnit.
Fixed reading .mix/config.exs
Merge pull request #2373 from jwarwick/cli

Fixed reading .mix/config.exs
Merge pull request #2365 from MSch/exunit-on-exit

Support on_exit for registering callbacks in ExUnit.
Move on handler functionality to its own module
Also support on_exit on setup_all
Deprecate teardown and teardown_all
Get rid of Mix.Sup
Initial PowerShell script addressing mix commas
Merge pull request #2376 from chyndman/initial-mix-powershell-script

Initial PowerShell script addressing mix commas
Grammar fix.
Merge pull request #2378 from scrogson/patch-1

Grammar fix.
Avoid race conditions on ExUnit test suite
Fix broken promise in Kernel.SpecialForms
Merge pull request #2379 from jw2013/master

Fix broken promise in Kernel.SpecialForms
Support E in scientific notation for floats
Soft deprecate size/1

Closes #2356
Provide Protocol.derive/3
Migrate from size to byte_size and tuple_size