Uses the showable mixin, has cleaner template, adds some default effects, uses the new overlay.
Bumped showable
Using effect instead of data-effect and hidden
instead of hide
Style fixes
Style updates
Merge pull request #2 from segmentio/updates

Using showable to show and hide. Updated the API.
Bumped overlay
Bumped showable
Updated overlay
Added hidden class to force transitions to work
Automatically rewritten for npm.