Refactor out pomodoroItem template
Add endDate(), remaining() and done() to Pomodoro

Teaching notes:
Use Collection transform function, see
http://www.okgrow.com/posts/2014/05/19/meteor-transform/
Merge branch 'add-pomodoro-functions'

Conflicts:
	tests/jasmine/client/unit/templates/pomodoro_item_spec.js
Pomodoros subscription was moved to router.js a few commits back
Improve format of pomodoroItem

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