Safari fixes

Added appaerance to ignore Safari's standard input field format on .search-input

-webkit-appearance: none;
-moz-appearance: none;
appearance: none;

![bildschirmfoto 2014-09-17 um 08 56 30](https://cloud.githubusercontent.com/assets/980778/4299514/024f5052-3e38-11e4-89d8-cb5ebdadc219.png)

deleted overflow:hidden on .tag because of totally black'd tag labels.
![bildschirmfoto 2014-09-17 um 08 56 11](https://cloud.githubusercontent.com/assets/980778/4299513/022aacde-3e38-11e4-90b2-902b5d9f2830.png)

PS: I don't know how you're working with those minified CSS files but it could be very helpful if safari issues could be fixed comfortablier ;-)