Lock the Ruby version to 2.1.0

Due to incompatibility issues with the eventmachine gem. See more info here:
https://github.com/eventmachine/eventmachine/issues/505
Hero
Rest of content
Landing nav
Nav sizing
Content
Train shouldn't be there in mobile...
tweaked gem
What Is It section additions
Link weight
Video plays onclick
Favicon, typo
Renaming files
Padding