Can't listen to events when injecting component in non-vue project

[JudahDoupe]

When using Vue as a library injected into another project, we are unable to catch the events due to naming. We get a "Vue Tip" warning in the console which keeps us from being able to catch the event.

[Vue tip]: Event "dateselected" is emitted in component at App.vue but the handler is registered for "dateSelected". Note that HTML attributes are case-insensitive and you cannot use v-on to listen to camelCase events when using in-DOM templates. You should probably use "date-selected" instead of "dateSelected".

Changing the event name from "dateSelected" to "date-selected" fixed the problem.

[sethmfuller]

This pull request should fix the issue @JudahDoupe is talking about. If @liloow can merge the request, that would be great!