Calculate score and display it as a progress bar

This review has two parts:
- First, we calculate the score daily and add to a stored state over time. This allows the score to increase consistently. For example, here what the score calculation would have been over time for a random existing user.
﻿﻿![index](https://cloud.githubusercontent.com/assets/2423263/5205698/5784168c-754e-11e4-9c5e-b3c6ca5ec360.png)
- Second, we display the image and the score as part of the result screen (see screenshot).
![ios simulator screen shot nov 26 2014 10 00 27 am](https://cloud.githubusercontent.com/assets/2423263/5206154/4256d470-7553-11e4-8527-1dd8d6fd84f6.png)