Bug: As we always returned null for JsonObject, nothing was being saved

Tweak: Save the timestamp as well as the stated date. The date is user-local time whereas the timestamp is UTC, which may be of use when locating users later
Create code to iteratively download the entire corpus. Modify the logging in Async.... so that we can see which job each log message refers to, as we'll be runnnig 1,600 jobs in one go now.
Tweak/Bug: Local Eclipse config files shouldn't be in source-control
Tweak: Make sure local Eclipse project files are ignored from now on