[erlang-patches] erl_tidy option to print to stdout

[Aaron France]

Hi all,

I've read the contribution rules and received some cursory guidance from
nox in IRC so I hope I don't awaken any wrath from the format.

I've added an option to erl_tidy to simply print to stdout. These may seem
a trivial thing to want to have in but my use-case is wanting to build
intermediary steps around erl_tidy and not simply replace the underlying
file.

Personally, I want to have this (and I am working on it now that I have
patched it in) available to erlang-mode in emacs. So that I can have a save
hook for formatting the code properly. Dealing with files is less than
stellar but dealing with the unixy stdin/out method is far nicer.

I have this set up on:
https://github.com/AeroNotix/otp/tree/feat/erl_tidy_print_to_stdout

I added the requisite source and added the docs for it in the right areas.

Regards,
Aaron
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