Add manage cookbook dropdown

The buttons in the cookbooks sidebar are getting out of hand so this moves the functionality into a common manage cookbook dropdown.

From button city

![screen shot 2014-07-23 at 9 50 24 am](https://cloud.githubusercontent.com/assets/316507/3674207/82366278-1274-11e4-9785-9dbdb65acf83.png)

To

![screen shot 2014-07-23 at 10 01 10 am](https://cloud.githubusercontent.com/assets/316507/3674214/8a1e77fa-1274-11e4-93e3-70a8d3fc3f9f.png)