Implemented Traverser and Scraper for Swahili Wikipedia archive

A simple python scraper that can extract text from a wikipedia archive.

![screen shot 2014-07-31 at 10 29 03 pm](https://cloud.githubusercontent.com/assets/1121789/3770317/0ad62d46-18e9-11e4-9f54-21e4e4e22aab.png)