#1920 - Download links option supports an array of formats to customize resource listings
Merge pull request #1968 from macfanatic/1920_download_links_formats

#1920 - Download links option supports an array of formats
cleanup Gemfile

Everything should work exactly the same. I moved a couple gems into the test
group because they don't seem to be used in development, and otherwise reorded
everything so the list is alphabetical.
update Travis to use latest Rails maintainence releases
try updating bundler
Fix for Draper changes failing cuke
Fix for remaining cukes failing (from #1966)