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* Support Windows line endings

Previously, since the file was opened as bytes but written as text, \r\n
got written as \r\r\n, since it read in \r\n as bytes, passed through
the \r, then wrote out \r\n as text, which automatically transforms \n
into \r\n on Windows, resulting in \r\r\n. This commit fixes that.

* Improve line ending handling

* Add appveyor config

* Remove all newline translation

* Remove newline arg from binary open

* Add regression test and make requested change

Also unhug listcomps / dictcomps / setcomps

Fix extra comma in tuples which contain a fix in their first element

Fix parsing of zero-length tokens

Add trailing commas on function defs if --py36-plus is passed

Special case handling tuples

Handle multiple functions in the same starting position

Remove automatic py35+ syntax detection

Resolve commas in one stage for multi-line string nodes

Don't unhug things containing only a triple-quoted-string

Don't introduce trailing whitespace on blank lines when unhugging

Simplify functions now that we are handling unhug of (

Change back to single pass now that it is top-down

Handle parenthesized things and more proper reindenting