Feature Request: Integration of Trello

I'm currently using Trello on my job and home projects. If we can integrate the Trello boards with the Frame, it will be useful. In this way, our task can be synchronized with Trello. In the same time, we can complete our the Trello tasks.

But firstly #5 new column feature must be active. I'll review the [API documentation](https://developers.trello.com/v1.0/reference) of the Trello.