add CTR codes
Merge branch 'master' of https://github.com/sl3760/WebSearchEngine

Conflicts:
	project/data/ads/ad.json
	project/src/edu/nyu/cs/cs2580/QueryHandler.class
Merge branch 'master' of https://github.com/sl3760/WebSearchEngine

Conflicts:
	project/src/edu/nyu/cs/cs2580/Advertisement.java~
finish CTR record codes