Explanation of URL checking at start of questionnaire

The spinner can take up to 30 secs. There’s no feedback as to what its doing. It implies it is saving.  We propose:
1. explaining to the user what they are about to do at the beginning of the questionnaire (possibly a 1,2,3). 
2. Show only one field to fill in at the beginning (the url) 
3. Pop out message says “one moment while we check the url”
4. Then the rest of the questionnaire appears

![tinygrab screen shot 13-01-2014 14 31 31](https://f.cloud.github.com/assets/4105469/1901170/71080f0c-7c5f-11e3-9d8e-0727d6cd9e28.png)