- change inteface for store
Merge branch 'master' of https://github.com/baont/thesis

Conflicts:
	DbExperiment/src/dbexperiment/store/IStore.java
	DbExperiment/src/dbexperiment/store/MemoryStore.java
	DbExperiment/src/dbexperiment/store/MongoStore.java
	DbExperiment/src/dbexperiment/store/MySqlStore.java