notary_db - (m) Fix typo
notary_db - Implement time cap for report_observation()

If an observation is updated within 48 hours, backfill data
and append to the same record.
Otherwise insert a new record.
test/unit_tests - Update tests to use the new observation limit
CHANGELOG - Update note for observation caps
notary_http - Increase version number for 3.2

Finally, DONE!