Updated calender position depending on topsites

Fixed the calenders position and paddings depending if topsites was enabled or not.

* Changed the padding of .container to 15px from the top
* Updated .container CSS to use shorthand
* Removed CSS rules from topsites-false as no change is needed (handled by .container CSS rules)
* Updated topsites-true to move calender down a further 25px to accommodate for topsites
* Removed margin on [date-picker] as it wasn't needed

Previews:
![image](https://cloud.githubusercontent.com/assets/6258213/3009899/d2e01298-df0a-11e3-9541-dfe7fa83c4dd.png)
![image](https://cloud.githubusercontent.com/assets/6258213/3009900/db90381e-df0a-11e3-89e1-facc59557367.png)