Added baseUrl method to Jquery Address

Jquery Address is missing a few static methods according to the documentation (http://www.asual.com/jquery/address/docs/).
history needs an overload : 
![image](https://cloud.githubusercontent.com/assets/874898/3455755/ec3b13a6-01e6-11e4-8190-ae5df29b9d69.png) 

see getter / setter pattern http://definitelytyped.org/guides/best-practices.html