Merge pull request #84 from kl/master

Fixed Vimeo
Bump version
Youtube upgrade - ignore removed video link
Update downloader.rb
Merge pull request #85 from Strnadj/yt_upgrade

Youtube Upgrade
Remove 1.8.7 support from travis

By now everyone should be off 1.8.7
OSX doesn't default to it anymore either.
Improved file name checking