Minor fixes for radio buttons

2 minor fixes in this PR

1. The radio button appears at the bottom of a multi line option, making it somewhat difficult to identify the option in a MCQ question. I've fixed it by moving the radio button at the top. Not sure if using `float` is a good idea, but it does fix the visual bug in chrome. See below for the changes in the UI

2. The radio and checkbox options for survey does not include an id. Added `id` for the radio/checkbox so tapping on the label triggers the radio/checkbox state

**Original**
![screen shot 2014-08-08 at 4 05 42 pm](https://cloud.githubusercontent.com/assets/571891/3854320/c142726e-1ed5-11e4-8b79-a4f0b82d2ed9.png)

**PR**
![screen shot 2014-08-08 at 4 06 18 pm](https://cloud.githubusercontent.com/assets/571891/3854319/c13e003a-1ed5-11e4-85b6-8bdc124f0eb6.png)