DS-1641 Batch ItemImport from XMLUI

Batch Item Import from the User Interface.
https://jira.duraspace.org/browse/DS-1641

If you can create a SimpleArchiveFormat package, and zip it at your computer, you can now upload that ZIP, to batch import a series of items to a collection from your browser.

Upload Form
![screen shot 2014-07-28 at 4 55 27 pm](https://cloud.githubusercontent.com/assets/58014/3727036/8ef17844-1699-11e4-8f13-a7616dc6ba12.png)

Afterwards, the results:
![screen shot 2014-07-28 at 2 41 13 pm](https://cloud.githubusercontent.com/assets/58014/3727021/69b12b88-1699-11e4-8df9-0f40b70cab14.png)

There is also a YouTube screencast of me demo'ing it.
https://www.youtube.com/watch?v=SSzQxyCTzpI&feature=youtu.be