Feature/view only link banner fix

<b><bold>Purpose</bold></b>

This PR removes the view_only_link warning for read_only contributor

Closes https://github.com/CenterForOpenScience/osf.io/issues/1330

<b><bold>Changes</bold></b>
![screen shot 2014-12-09 at 2 59 31 pm](https://cloud.githubusercontent.com/assets/4974056/5364732/08e9f026-7fb4-11e4-86ca-8adb5db22fa1.png)