Add a prop to disable the create new Event function

[matthias-eb]

I would like to use your calendar to display a set of events to users. They should normally not be able to create a new event, but I cannot find an option to disable the new Event dragging. I am currently working around that by setting the new event to display: none, but the transparent div covering the page when creating an event has no class, making it hard to remove.

A property that disables this feature thus would be really helpful.

On a side note, the Documentation for Kalend is missing a description on how to create an event that spans a full day, although an example can be seen in the readme.md file, where the event is on the top of the Day column.