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
Add a note about Enum.sort/2 stability, closes #2163
Accept :structs, :binaries and :char_lists as iex inspect options
Merge pull request #2169 from mururu/iex-inspect-options

Accept :structs, :binaries and :char_lists as iex inspect options
Fetch if remote converger updated dependency lock
Merge pull request #2170 from ericmj/mix-unloaded-name

Fetch if remote converger updated dependency lock
s/records/structs in protocols docs
--app argument should be converted to atom
Merge pull request #2173 from zambal/master

--app argument should be converted to atom