handle phrases
Changing QueryPhrase make it could store terms that not in a phrase.
Optimize phrase handling.
merge develop
delete data
Merge branch 'develop' into Phrase-handling
test case
test cases.
Merge branch 'Phrase-handling' into develop
Fixed bug in leaner ranker.
Update query and fix bug for pdf compute
fix server issue
merge to develop
resolve merge conflicts
Fixed a bug in phraseHandler
Merge branch 'develop' of https://github.com/relentlesscoder/WSE into develop

Conflicts:
	homework3/src/edu/nyu/cs/cs2580/QueryHandler.java
refactor
Merge branch 'develop' of https://github.com/relentlesscoder/WSE into develop
refactor
use ascending to break tie