Create Form Elements for Modifying Category Meta Data

[gmcquillan]

We store metadata on the backend about each category. Some of this is meant to be modified by the user. We need to provide those form elements so that the following elements can be modified:

• human_name -- the human readable version of this category. We might consider making this default to the first 30 characters from the signature.
• threshold -- the ratio of sameness required for a successful match for this category.