[Tracker] Tidy-up the codebase

[debloper]

• Move the components into separate directories
• Use GitModules, to keep the component reusable & un-coupled
• Cleanup JS, use closures and scope the methods under a namespace
• Use web-components ( Mozilla Bricks? ) for most of the templating works

[ngsankha]

Do we really need Mozilla Bricks? We don't even have a button on the leaderboard. If you ask me, just a plain CSS does good.

[debloper]

You are right... the overhead will be too much compared to the actual app.
We still can use native-templateing, though - better than pushing DOM-string with JS.