added wikiIt and optional command argument of input type
change the inputStream to retrieve single warc files from wikiIt
changed the wikiIterator
removed un-necessary files and updated README
added sample wiki file
updated README
indentation and minor fixes in wikiIterator
modified README, add descriptions about getting wikipedia and converting to text
added link to README
Merge pull request #1 from wy1024/master

Add wiki extractor.