0.4.19

Bugfix release which corrects emoji parsing & localization issues.

• Add DataArray#into, which lets you index into objects without flattening.
• Renamed 'header' to 'section' in task metadata; 'header' will remain around for a few major releases to let people
  naturally migrate.
• Fix #487: You no longer need spaces around '*' in expressions.
• Fix #559: Fix unicode issues in variable canonicalization which was causing problems with non-Latin inline field
  keys.

Duration Parsing

You can now include multiple units in durations: dur(8 minutes, 4 seconds) or dur(2yr8mo12d). You can separate
durations by commas, or use the abbreviated syntax with/without spaces.