modifies preview display to be consistent with list view

Fixes #411 

Preview content is now consistent with list view (default) search results view of an item. This should reduce the amount of duplicated code.

@jvine let me know your thoughts.


![screen shot 2014-07-29 at 2 55 22 pm](https://cloud.githubusercontent.com/assets/1656824/3742615/a4ccf72e-176b-11e4-86b7-5a3e14148869.png)
![screen shot 2014-07-29 at 2 57 37 pm](https://cloud.githubusercontent.com/assets/1656824/3742616/a70952b2-176b-11e4-9258-02ffe8cbb8a7.png)
![screen shot 2014-07-29 at 2 57 48 pm](https://cloud.githubusercontent.com/assets/1656824/3742617/a98ebfe0-176b-11e4-9318-868cd25a59fc.png)
![screen shot 2014-07-29 at 2 58 08 pm](https://cloud.githubusercontent.com/assets/1656824/3742620/ac23539c-176b-11e4-8b9e-a750bb614d8d.png)
![screen shot 2014-07-29 at 2 59 21 pm](https://cloud.githubusercontent.com/assets/1656824/3742622/af9621ee-176b-11e4-8133-a225da73599d.png)