Ensure Macro.escape also respects nested quotes
Add pwd and cd helpers to IEx
Improve docs for Dict
Fix the build
Add cover support to mix test
Do not run cover tests before R16
Improve error message on unclosed interpolation/string, closes #794
Support --help and -h in elixir and iex, closes #854
Fail if an application can't be started, closes #869
Add Path.t (for input types) and Path.r (for output), closes #873
Revert "IEx autocompletion should show all exported functions, not only documented ones"

This reverts commit 3ffc5e9e8497cac9312dc02dbb8f763b9ee9edf7.

Closes #879.
Added File.listdir API
Added File.listdir! variation
Fixed File.listdir! to return the list, without wrapping it in {:ok, _}
renamed to ls, added unit tests
File.ls & ls! tests now cover non-existent directory situation
Use at least 2 runners regardless of the number of schedulers
Improve docs and exceptions for regexes
Ensure unquotes are respected in the test macro
Also allow unquoting on setup and teardown callbacks