Revert "Revert "fix(tasks): tmp fix for #4066, minimize:false on tasks so they have""

This reverts commit 0fa7277cf073c6875c09a9a0735311902823c1e1.
require moment where necessary
fix(challenges): since we're setting {minimize:false} on tasks, don't
overwrite user tasks.*.challenges in the _.merge()
Merge pull request #4108 from HabitRPG/paglias/tags

Paglias/tags