Changed tweet text to be less spammy and remove hashtag "#cutgroup"

Changed text from: "I just signed up to test civic apps in Chicago and got $5, check it out: http://cutgroup.smartchicagoapps.org/  #cutgroup" to ""Sign up to test civic apps in Chicago for @SmartChicago. $5 for a signup; $20 for a test:".

This change was prompted in part by this Twitter exchange: https://twitter.com/whet/status/398866642257465344