Also support :sync mode in GenEvent, make :ack one the default
Check for terminal support from Elixir command line
Check for terminal on both stdout and stderr
Ensure elixir and iex works on MinGW
Bind value to proper name in `elixir_tokenizer`
Merge pull request #2663 from lexmag/fix-pipe_op

Bind value to proper name in `elixir_tokenizer`
Update CHANGELOG
Release v0.15.1
Add Stream.interval/1 and Stream.timer/1
Clean up interval/1 and timer/1 docs
Merge pull request #2664 from hamiltop/add_timer_and_interval_streams

Add Stream.interval/1 and Stream.timer/1
Add special case for lists in Stream.cycle
Merge pull request #2666 from hamiltop/stream_cycle_performance

Add special case for lists in Stream.cycle
Start v0.15.2-dev
Ensure code escape \ works in IEx
Fix example in config/config.exs that's created for new projects.
Merge pull request #2667 from MSch/fix-new-config-exs

Fix example in config/config.exs that's created for new projects.
Use quotes to avoid space-in-path issues with cygpath
No need in some purges in `Kernel.WarningTest`
No need for `Stream.` prefix