Changed target to API19.

Added moving text to tab textviews if text overflows its view (width of text bigger than TAB_WIDTH.
Text scrolls when user scrolls through tabs or when user clicks on a tab.

![screenshot_2014-04-10-11-16-15](https://cloud.githubusercontent.com/assets/4922517/2666251/e06f802c-c099-11e3-8133-5723f404c5c2.png)
![screenshot_2014-04-10-11-16-11](https://cloud.githubusercontent.com/assets/4922517/2666250/e06f7726-c099-11e3-8793-f7b9bd5a6058.png)