[no-more-1.9.x] gemspec now asserts support only for >= 2
[emoji] Added spec for CreateSlidesHtml+Emoji
Dropped support for 1.9.x. It's only 2.0.0.

The 'to_h' of OpenStruct introduced in 2.0.0 is now being used to hand
off data between the OpenStruct config and the asset pipeline (which
expects a hash).

* no-more-1.9.x:
  [no-more-1.9.x] gemspec now asserts support only for >= 2