Add http endpoint for resultset
Update description of conf property
Return Response object from QueryExecutionService.getHttpResultSet
Update test for not found exception in case of result not persisted by server
Update documentation
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
Merge pull request #43 from InMobi/http-endpoint

Http endpoint for query result