Make adding todos more robust with priority support and fix strange behaviors

[tauren]

This workflow is quite useful as is, but it would be way better if it supported including priority when creating tasks. Typing this doesn't work to add a todo:

t (B) something

Also, for some reason, if the todo starts with wir then it doesn't work when adding a project (+). All of the following do not work when adding todos:

t wireframes +foo
t wire frames +foo
t wire +foo
t wir +foo
t wir frames +foo

However, it seems to work with other words, such as the following.

t something +foo
t create wireframes +foo
t wi frames +foo

Using @ instead of + also works:

t wireframes @foo
t wire frames @foo
t wire @foo
t wir @foo

Lastly, if I put a # anywhere in the todo, it and everything after is excluded.