Update selector to get event metadata to reflect Google's DOM changes.

• Add support for Russian.

• Add support for Polish.

• Properly calculate duration for overnight events (broken in 2.1.0).

• Includes a new option to display durations in a "decimal hours" format ("2.5 hours") instead of the default "hours + minutes" format ("2h 30m"). You can set this option by clicking the extension icon.
• Fixes a bug that several users reported, where short events with locations would cause durations not to show up on other events.

• Properly calculate diffs for events that start around midnight.

• Adds support for Chinese, Japanese, and Korean languages.

• Properly calculate durations for Deutsch and Francais languages.
• Properly calculate durations for short events with a location.

• Support splitting times on both en- and em-dash, with or without spaces

• Properly calculate durations for events that cross midnight.
• Assume new calendar if old calendar not detected.