Plain user bundle export

### Story
https://www.pivotaltracker.com/story/show/76397158

### Notes
* Created new new non-admin user controller
* Added button to measures view / dashboard for bundle export (I'm sure there is a better location for this)
* Added test for user bundle export

### Screenshots
Current export bundle button
![export bundle button](https://cloud.githubusercontent.com/assets/323608/3936061/c42d7948-249c-11e4-8a28-275272e26d44.png)

I noticed you're using bootstrap's `.btn-wrapper` code with some adjustments. With LESS you can make use of bootstrap's code in the class:

```
.btn-wrapper-bundle {
   .btn-wrapper;
    display: inline-block;
    right: inherit; // overrides the value from .btn-wrapper
}
```