Display modal window for preview of the imported data

![inspire - high-energy physics literature database](https://cloud.githubusercontent.com/assets/3083746/4151698/5230e31e-3448-11e4-8894-a7e4885fb1dd.png)
![inspire - high-energy physics literature database 1](https://cloud.githubusercontent.com/assets/3083746/4151697/522d8368-3448-11e4-8fe4-b3efce92d47c.png)
After some thinking-over this is better to be done on the import callback with `one` instead of `on`. Then we can use the closure to have access to the messages from import result and don't need to do all the combinations with the message box which complicate the code.