Added methods for deleting users
Added scheduled job for purging anonymous users
Merge remote-tracking branch 'origin/master'
Ensured command line runners close Spring ctx
Changed lookup of user's assessments + cand sesns

I've reverted back to query lookups rather than 1-many
lazy loads, as the latter caused a regression and wasn't
really required. It's probably safer the way it currently is.
Updated to Spring 3.2.1, Hibernate 4.1.9
Updated Jackson to V2 (though not really used)