Added Attribute Category and Types to Track Targeting Data

In order to leverage this platform to better track incoming attacks (blocked and successful) as well as to contextfully ingest threat indicators from them I wanted to add some additional targeting attribute types. These will hopefully allow for creation useful long term metrics and potentially identify highly vulnerable (or highly targeted) users/departments/orgs. 

I broke this out from within the other categories as separation seemed best since this is org. specific data which won't be of value externally as threat indicators, I'll later force all entries into this category type to be "Organization Only" classified to limit sharing and potential mistakes upon manual entry, while allowing other attributes attached to the event to be shared across trusted partners. 

This appears to be functional, and I haven't hit any errors, but I feel as though I might need to duplicate these changes to ShadowAttribute.php as well? Feel free to use this or not :)  Thanks again for a great platform! 


Example in types/attribute matrix & descriptions:
![screen shot 2013-12-19 at 1 02 25 pm](https://f.cloud.github.com/assets/2313682/1784831/08a5a986-68d9-11e3-9735-adf7704bfac5.png)
![screen shot 2013-12-19 at 1 02 46 pm](https://f.cloud.github.com/assets/2313682/1784832/0c3bae4c-68d9-11e3-8be7-7674c237eae4.png)


Example in event:
![screen shot 2013-12-19 at 1 14 39 pm](https://f.cloud.github.com/assets/2313682/1784842/38e171c0-68d9-11e3-9669-182f5c31e896.png)