Initial pry handling
Make the taking over process the evaluator
Test IEx.Server start options and configurations
Keep IEx helpers around for pry
Add IEx.Helpers.respawn
Extract IEx.Evaluator to its own process
Make ExUnit autorun configurable
Move booting process to IEx.Server and allow take over
IEx.Server.boot -> IEx.Server.start
Improve IEx.Server coverage
Merge pull request #1761 from elixir-lang/jv-pry

Provide IEx.pry functionality