StoreTransaction CSV Export Field Updated

Add the student name
Add the store item name (title)
deleted: don't include this field
item: strip out all but the ID portion
context_type: filter out items with unit_points_reset here
reversible: don't include this field


Please find the new CSV here :
https://drive.google.com/file/d/0B4L5_YAjviTASGxBTVl5bjFOUHM/view?usp=sharing
Here, you are catching the possibility that this might not exist, but if it doesn't, do we want to fail silently? The user will just see a blank entry for the item on a store transaction log, which is weird and an indicator that something is wrong. Maybe it's better to throw an error. What do you think?