allow user to toggle between readable and raw form data

http://manage.dimagi.com/default.asp?111046

Readable Mode:
![screen shot 2014-04-30 at 12 25 06 pm](https://cloud.githubusercontent.com/assets/137212/2840469/ed398232-d055-11e3-9395-77520b1c110c.png)

Raw Mode:
![screen shot 2014-04-30 at 12 25 15 pm](https://cloud.githubusercontent.com/assets/137212/2840468/ec167de2-d055-11e3-8394-c0bc971ebd2b.png)

http://manage.dimagi.com/default.asp?111047

Not showing questions not shown to the user (default):
![screen shot 2014-04-30 at 2 18 04 pm](https://cloud.githubusercontent.com/assets/137212/2841061/8ceee1d6-d061-11e3-8db4-34b78a859fd2.png)

Showing questions not shown to the user:
![screen shot 2014-04-30 at 2 17 32 pm](https://cloud.githubusercontent.com/assets/137212/2841062/8cf062ae-d061-11e3-9467-ac7af351a746.png)