TaskPaper scanner

Hi, there.

I've written a scanner for [TaskPaper](http://www.hogbaysoftware.com/products/taskpaper).
TaskPaper is not a programming language but a text-based todo management tool.

It's syntax is very simple:
- The lines that contain ':' are treated as a project
- The lines that start with '-' are treated as a task
- Other lines are treated as a comment

For example:
```
Household chores:
	- Pick up the milk
	- Do the laundry
Programming:
	CodeRay:
		- Fork coderay @done
		- Write a taskpaper scanner @done
		- Send pull request
	Others:
		- ...
```

Thanks for reading.
Sho SHIMOMURA.