Add query expansion
	modified:   search-pipeline/.classpath
	modified:   search-pipeline/environment.properties
	modified:   search-pipeline/src/edu/columbia/watson/twitter/SearchMain.java
	modified:   search-pipeline/src/edu/columbia/watson/twitter/util/GlobalProperty.java
	search-pipeline/lib/ark-tweet-nlp-0.3.2.jar
	search-pipeline/lib/dict/
	search-pipeline/lib/jaws-bin.jar
	search-pipeline/src/edu/columbia/watson/twitter/QueryExpansion.java
Add model file