Added the possibility to set a customizable visual divider between Tab I...

...tems

I'm using your component in my APP, but in the design that I got there are small divider lines that I had to add to your code. Now I tried to implement them with flag (default:NO) and color settings(default: textColor) into your code.

Hope you like it, so I could go back to use it again from Cocoapods

![screen shot 2014-07-25 at 17 59 55](https://cloud.githubusercontent.com/assets/2573013/3704496/c2049aa4-1414-11e4-8167-bd5c6eae1481.png)