Merge pull request #3 from infotexture/feature/Add-TP-todo-fmt

Add `.todo` as recognized TaskPaper extension
Merge branch 'develop'

* develop:
  Update Hazel script to exit w/ status of last command per Hazel Help:
  Add Hazel autoexport script
  Add `.todo` as recognized TaskPaper extension
Merge remote-tracking branch 'upstream/master'

# Via Paul Sidnell
* upstream/master: