Add `.todo` as recognized TaskPaper extension

Fixes psidnell/ofexport#2
Merge branch 'feature/Add-TP-todo-fmt' into develop

* feature/Add-TP-todo-fmt:
  Add `.todo` as recognized TaskPaper extension
Add Hazel autoexport script
Merge pull request #3 from infotexture/feature/Add-TP-todo-fmt

Add `.todo` as recognized TaskPaper extension
Update Hazel script to exit w/ status of last command per Hazel Help:

> "When using scripts via the "Run shell script" action, the script
> should return 0 to indicate that the action was performed successfully.
> Any other value indicates an error and the rule will be re-executed
> until the action proceeds successfully."
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: