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remove dependency on `downloader` #203
R 3.2.1 should now be able to handle https:// on Windows by default (see http://developer.r-project.org/blosxom.cgi/R-devel/NEWS/2015/07/07#n2015-07-07). However, we can't expect all users to be up-to-date with their R versions (especially Windows users).
Until then, we can not import, and simply copy/paste the code from