Fixed Kernel.match? example. Added formatting to Kernel docs.
Merge pull request #1492 from jwarwick/kernel_typo

Fixed Kernel.match? example. Added formatting to Kernel docs.
Update ExUnit.Assertions docs, closes #1493
Ensure environment is set before any task is executed, closes #1490
Group ExUnit.start calls into one, closes #1489
Add umbrella: true to supported deps options
Get rid of Mix.Tasks.IEx
Use %B on docs
Add mix cmd
Support --color option in ExUnit

The option can also be passed via mix, closes #1364
Update CHANGELOG
Allow defmacrocallback to be specified in Behaviour
Properly treat :<<>>, :[] and :{} as atoms
Do not double escape strings inside interpolation, closes #1494
Only set preferred cli env if MIX_ENV is nil