Iteration title

[dzieciou]

I would change:

Task 1/10; Iteration #1 

to

Iteration #1; Item 1/2

because:

• we have multiple "items" within an "iteration" to annotate
• the "task" is something different (actually the whole annotation process is a task)

[pkubiak]

probably fixed in https://github.com/dzieciou/tree-labeller/pull/30