Update entry data after submitting it

[bytorbrynden]

Currently, we submit entries to Firebase, and never check for updates on them.
This isn't ideal, as some members of the Khan Academy community like to enter contests with "WIP" entries.

We don't store the code for entries, we just make another call to the KA API for that data when we need to, but, entry names are stored, therefore we should probably check for changes in them, and update the data on Firebase accordingly.