Fixing CHANGELOG typos
Merge pull request #1895 from jwarwick/change_typos

Fixing CHANGELOG typos
Improve typespecs when formatted as strings
Ensure we have a project before popping the stack
fix for issue #1896

If the enumerable is an even multiple of the counter (n) and an explicit
pad is given, you get an extra element.

Enum.chunks([1,2,3], 3)
iex> [[1,2,3]]
as expected, but

Enum.chunks([1,2,3], 3, 3, [""])
iex> [[1,2,3],[""]]
as not expected
Merge pull request #1897 from gvaughn/chunks_fix

fix for issue #1896
Add List.update_at/3
Add typespecs to List
Support ExUnit tags for customizing tests in callbacks
Move test outcome to an explicit state
Fix failed IEx test that depended on ExUnit types
Store tags in context, remove records from context