Backend hbase scanner applies start/end keys.
Also added new hbase-backed test table hbasestringids, which maps hbasealltypesagg, except the row key/id column is a string
(otherwise it's not possible to apply query predicates).
- added support for mvn based builds and also a driver script 'recreate_store.sh' to regenerate the data.
- switched test setup to create test tables via a hive cli script rather than programmatically
- added script to load data into default.AllTypes table (24-way partitioned)