Show remaining time in status bar and more

[dzindra]

Just made few modifications that show remaining time in status bar (as requested in #1) and added ability to pause timer (as requested in #2).

This PR is based on @oleksii-taran's version of the repo (and is effectively including all his commits too).

[ccidral]

Awesome! I'm going to check it out.

[dzindra]

Any news on checking? I have some more ideas for new features like automatic switching between pomodoros and breaks :)

[ccidral]

Hi @dzindra. Please standby, I'm rewriting the project from scratch because the current design is a bit 'rigid'. The new design is based on an event bus, which I hope will make it a lot easier to modify and add new features.

[grmiguel]

I also was thinking about making it to switch automatically between pomodoros and breaks :). Can't wait for that rewritten version, @ccidral !

[ccidral]

@grmiguel Great, that should be much easier to do with the new design. Stay tuned.

[ccidral]

Hey guys, I just pushed the newly rewritten project (39017a4). Please take a look at it and tell me what you think. Now there's an event bus that components use to be notified about specific events, like timer events or changes on preferences. Also, almost everything is now covered by unit tests.

Questions, suggestions and critics on anything related to code and design are welcome. I'm a newbie when it comes down to Objective C and OSX programming, so please forgive me if you find something bizarre in the source code. Let me know (or make a pull request) if you stumble upon something odd.

I'm closing this pull request since @dzindra agreed to port his changes manually to the new version.