.gitattributes: Force .js files to have LF line endings (#399)
.gitattributes: Force .js files to have LF line endings (#399)

See https://help.github.com/articles/dealing-with-line-endings/

Addresses https://github.com/OctoLinker/browser-extension/pull/398#issuecomment-344091708
OctoLinker/browser-extension,OctoLinker/browser-extension,OctoLinker/browser-extension