Fix file extensions and line endings

[friederbluemle]

Three related commits to fix a few file extensions/formatting. No content changes.

See discussion in #660 for some context.

cc @rightparen

[facebook-github-bot]

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[jawwad]

@friederbluemle - What method did you use to remove the execute bit from the images? (Just wondering because these were weirdly being imported into our internal source control as empty files even though they were showing up correctly in git. Also you don't have to change anything, I think I've corrected the issue on our end).

[facebook-github-bot]

@jawwad merged this pull request in 4fb2b1f.

[friederbluemle]

@jawwad - The command I used was something like:

git ls-files 'samples/**/*.png' | xargs chmod -x

A good test on any repo is to locally run chmod -x on all files in the repo, then verify that the files that show as changed in the working directory are actually the ones that should be executable.

[jawwad]

@friederbluemle - Cool, that's a nice tip. In that case, the issue would have been a quirk on our end since I just ended up undoing changes to the png files and then ran chmod -x on them which fixed the issue.