User Profile: I'm Doing

First pass at the "I'm Doing Section" per #3261.

* Adds `dosomething_campaign_get_campaigns_doing()` function to return active standard Campaigns a User has signed up for, but not reported back on yet.

* Displays No Signups Header / Copy if User is not doing any campaigns

* Removes `hook_user_view` and `profile.inc` files to keep Profile preprocessing in one file (theme.inc)

* Removes unneeded address elements as per #3261

## todo:
* Display "You're Doing" campaigns as Gallery items instead of Campaign blocks

## Screenshots

![profile-v1](https://cloud.githubusercontent.com/assets/1236811/4813156/f3dc8202-5ec5-11e4-9dd4-0175e05aa887.png)