Change youview schedule ingest to +7 days

Also took the opportunity to use LocalDates rather than
DateTimes, since we're setting up the job in terms of days
rather than midnight-midnight periods, and some of the code
was making assumptions on how others behaved (e.g. in
schedule trimming), which could be dangerous.
Merge pull request #460 from atlasapi/youview-plus-7-days

Change youview schedule ingest to +7 days