ItemsContentProvider: Correct a SQL column name.
Remove unused code.
ItemsContentProvider: Remove unused parameters.
Comment out an unused method.
.iml file changes for FindBugs.
SyncAdapter: Make a constant private.
Improve some Log messages.
ClassifyFragment: Warn (and don't crash) if we cannot get a Next item.

This can happen if the network is connected but is not really working.
ZooniverseClient: Raise the maximum count of items to request.

Because our SyncAdapter seems to manage this much better, with no noticeable
effect on the UI responsiveness.
UiUtils: Move error messages to strings.xml so we can translate them.