Update status colors

Hi team, is are some options for colors.

- Yellow is 'in progress'
- Green is 'completed'
- Purple is 'pending approval'
- Red is 'removed or cancelled'
- Grey is 'not started'

![screen shot 2013-07-28 at 2 48 49 pm](https://f.cloud.github.com/assets/2259146/868900/8efd8178-f7cf-11e2-9df9-542a4f298e1c.png)
![screen shot 2013-07-28 at 2 48 25 pm](https://f.cloud.github.com/assets/2259146/868901/91b88f66-f7cf-11e2-9dd0-9f54178d26ce.png)
![screen shot 2013-07-28 at 2 48 04 pm](https://f.cloud.github.com/assets/2259146/868902/93f4e838-f7cf-11e2-85aa-e5bec777e4fc.png)
![screen shot 2013-07-28 at 2 46 18 pm](https://f.cloud.github.com/assets/2259146/868903/9638a5b2-f7cf-11e2-9a53-d3a37beac077.png)
![screen shot 2013-07-28 at 2 51 31 pm](https://f.cloud.github.com/assets/2259146/868904/e52a1a34-f7cf-11e2-9134-c70ff83add2f.png)

// cc @michaelavila @brianriley