add ads index and ranker and a simple ads tsv file-a
Merge branch 'master' of https://github.com/sl3760/WebSearchEngine

Conflicts:
	project/data/ads/ad.json
	project/src/edu/nyu/cs/cs2580/QueryHandler$1.class
	project/src/edu/nyu/cs/cs2580/QueryHandler$2.class
	project/src/edu/nyu/cs/cs2580/QueryHandler$3.class
	project/src/edu/nyu/cs/cs2580/QueryHandler$CgiArguments$OutputFormat.class
	project/src/edu/nyu/cs/cs2580/QueryHandler$CgiArguments$RankerType.class
	project/src/edu/nyu/cs/cs2580/QueryHandler$CgiArguments.class
	project/src/edu/nyu/cs/cs2580/QueryHandler.class