Add tests for new strict option of date filter.
Add json_var filter to list in Template::Flute's main POD.
Allow deeper lookups into values hash with dotted values for field attribute.

E.g., <value="name" field="session.user"> will use $values->{session}->{user}.
Add tests for field attribute of value element.
Add strip filter.
Add test for strip filter.
Update MANIFEST with files for strip filter.