Search parent dirs to home, or root

WIP

tod now searches current directory for a '.todfile' and continues checking in parent folders until it either finds a '.todfile' or it ends up in HOME (~) or root (/). 

This way you can share a .todfile for all projects, if you wanted, in your home dir. 

TODO
- add ability to create a local .todfile in current dir (for sub projects/dirs)
- add output of where .todfile was created if one did not exist