A basic Wunderlist client.
Create a new list
Create a new task.
Complete a task with the given title in the given list.
Delete a list.
Delete a task
Return a dict with all a task with the specified title in the specified list.
Return the ID for a list
Return the ID for a task in a list.
Get all tasks belonging to a list.
Populate the lists with all tasks.
This must be run right after logging in, before doing any operations.