Bump version: 1.0.0-alpha.1 → 1.0.0-beta.1

Bump version: 1.0.0-dev.1 → 1.0.0-alpha.1

Bump version: 0.5.0-dev.0 → 0.5.0-beta.1

Don't import jQuery on Anki 2.1

2.1 already ships with its own jQuery build, so there's no need
to import our own.

Fixes an issue where the add-on would only work after restarting
Anki 2.1 at least once. Perhaps because of caching jQuery?

Rename add-on to Popup Dictionary

Update README, add GIF screencast

Update licensing information

Disable loading tooltio for now

Improve CSS parsing order and user CSS