Fixed incorrect handling of +iex command line parameter
Fix bad conditional logic when checking for +iex
Merge pull request #2175 from bitwalker/windows-shell-fixes

Fix bad conditional logic when checking for +iex
Merge branch 'master' of https://github.com/elixir-lang/elixir
Merge pull request #1 from OnorioCatenacci/master

Fixed incorrect handling of +iex command line parameter