task/ta36 -- "job" table job_ts fields requires value

bin/nparceld.py
* new function valdiate_file() which parses the filename to extract
  the timestamp

loader.py
* JOB_MAP global has a new field "job_ts"
* process() method accepts a new "time" argument which feeds directly
  into the job.job_ts column
* date_now() method now strips the last 3 digits off the microseconds
Merge branch 'feature/us21' into dev