Initial ExUnit.DocTest implementation
Add support for exception tracking in DocTest
DocTest: add a note on using standard output
Capture the offending expression in DocTest if we can't AST it
Somewhat better line reporting on doctest failures

The line isn't precise (because we don't know the line of the @doc
or @moduledoc), but it points to the line where the definition starts
Convert Kernel to doctests
Merge pull request #930 from yrashk/doctest-kernel

Doctest kernel