Add stub Dashboard and update 'Curation' links to point there.

Closes #243 

### Stub Dashboard Page
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![screen shot 2014-02-19 at 1 21 35 pm](https://f.cloud.github.com/assets/96776/2211961/98ec4bfe-99ac-11e3-879d-d8624c83d642.png)

### Navbar Dropdown
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![screen shot 2014-02-19 at 1 10 20 pm](https://f.cloud.github.com/assets/96776/2211974/b0d15dae-99ac-11e3-890b-a2608f832fa7.png)

### Link on Page#edit/new
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![screen shot 2014-02-19 at 1 11 32 pm](https://f.cloud.github.com/assets/96776/2211980/c16e8402-99ac-11e3-91bc-c0988cdbe141.png)