Assignment details

@peter-budo 

Who would've known that the assignment json would be so... spaghetti? :-)

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A nice touch (in my opinion) is that it starts off by displaying a "plain" dogtag if that's the reward, and then uses Picasso to download the real image if possible. Looks quite nice. :+1: 

Also, I created two new sets of icons - the new "award" and "rank" ones. I did create a set of icons for XP1, but since I didn't manage to create for XP0 nor XP2 (didn't try that one), I kept it local. Here's the xxxhdpi version of it:

![ic_stat_xp1](https://cloud.githubusercontent.com/assets/979152/2874528/8b1c4062-d3ed-11e3-83a9-2bc2bf16c30b.png)

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Build: http://ci.peterscorner.co.uk/job/BF4-Intel-PR/70/console