Remove is_map/1 optimization that breaks reduce on structs
Fix test error and warnings
Update release steps to rebuild build_info
Fix accidental commented code
Support maps in typespecs
Automatically define types for structs
fix matching on every map in Enum.into/2
use map_size guard, add test
Merge pull request #2164 from liveforeverx/fix_enum

fix matching on every map in Enum.into/2
Fix ExUnit.Assertions receive macros compiler warnings

Previously receive macros would produce warnings when a message was
supplied.
change some doc examples to iex style
Merge pull request #2167 from fishcakez/assert_warnings

Fix ExUnit.Assertions receive macros compiler warnings
Document how ErlangError works, closes #2166