Improve Enumerable count/member? docs
Change the Path module to work only with char_data and always return binaries
Convert File and IO to char data, use +fnu flag by default
Provide List.from_char_data! and String.from_char_data!
Rename iolist_* to iodata_*
Properly @spec functions in Path
Typespec and allow char data in File functions
Properly indent chunks in System module
Adds symlink to File

implementation of feature request #2114
Use werl instead of erl when executing iex.bat
Use smart shell for iex, and werl instead of erl
Merge pull request #2174 from bitwalker/windows-shell-fixes

Use werl instead of erl when executing iex.bat
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
Small grammar fix
Minor grammar tweak

Subject/verb agreement at the top
Merge pull request #2178 from augiedb/patch-2

Minor grammar tweak
Merge pull request #2177 from augiedb/patch-1

Small grammar fix
Proper error message for bad args to 'mix help'

Closes #2179.
Update example to use Map.put/3, accordingly with the last proposal

[Proposal 1](https://gist.github.com/josevalim/9acd0fe43063cbc33aa6)
has the update operation also put new keys in the map, while the
[2nd proposal](https://gist.github.com/josevalim/b30c881df36801611d13)
doesn't support this. The docs reflected the first proposal.