Revert "Nuke unnecessary referencing/dereferencing."

This reverts commit 8c215d2bb1f01091e945cae180545154c2ad56cd.

clearTimer: needs a reference to the ivar to nil it out

Conflicts:
	Pomodoro/Pomodoro-Info.plist
Merge branch 'master' of github.com:oysta/pomodoro
Add retina icons
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