Modify dependencies, add spring-context

* reproduce error

$ git clone https://github.com/phelanm/hazelcast-code-samples.git
$ cd hazelcast-code-samples && mvn install
..[ERROR] ../hazelcast-code-samples/hazelcast-integration/spring-data-integration/src/main/java/com/hazelcast/spring/mongodb/MongoMapStore.java:[132,34] cannot access org.springframework.context.ApplicationContextAware
  class file for org.springframework.context.ApplicationContextAware not found
  ..[INFO] Hazelcast Spring Configuration Example ............ SUCCESS [0.951s]
  [INFO] Spring Data Integration ........................... FAILURE [6.986s]
  ..[ERROR] After correcting the problems, you can resume the build with the command
  [ERROR]   mvn <goals> -rf :spring-data-integration
..