Closes #2357 - Changed weekly to use isoWeek for start of week
Adding message about using ISO weeks
Adding a weekly example
Standardizing on YEAR vs WEEK YEAR for everything but Weekly
Revert "Adding a weekly example"

This reverts commit 824ad05e8ad7e85b12fafd101e71b6809cca97bc.
Merge pull request #2379 from simianhacker/fix-intervals

Closes #2357 - Changed weekly to use isoWeek for start of week