Added LoadWikipediaArticles and WikiArticle

ivy was changed, you will need to rerun ant
Updated ivy and ivysettings

Removed lib from gitignore
deleted build.xml because we use eclipse and ivyde
added local hadoop2.0 compilations of spark to the ivy dependency
removed lib from gitignore and added spark libraries

The spark libraries are specially compiled to run with cdh4.6.0 on
hadoop 2.0.0
Wikipedia load scripts
Wiki