Close Hive server session when Grill session is closed
Use correct key type
Fixed import
Merge pull request #42 from jdhok/develop

Close Hive server session when Grill session is closed
Merge branch 'develop' of https://github.com/InMobi/grill into http-endpoint

Conflicts:
	grill-server/src/main/java/com/inmobi/grill/server/query/QueryExecutionServiceImpl.java