Tests for CASSANDRA-6839
Add test coverage for IN operator on column conditions
test skeleton implemented
working Json export/import
Implemented json_tools dtest
refactored to remove unnecessary code
pushed file i/o to CCM
moved file i/o back into the test
Accept null values in element access column conditions

Done for CASSANDRA-6839
made 'cp' windows-aware
changed rm command
cleanup
made 'cp/rm' windows-aware

changed rm command

cleanup
Merge branch 'fix_snapshotTest_windows' of github.com:riptano/cassandra-dtest into fix_snapshotTest_windows
typo fix
upgrade test updates

allow env defined upgrade path
provide better debug logging for tags used in upgrade tests
warn that CASSANDRA_VERSION is not honored by upgrade tests
Merge branch 'master' into custom_upgrade

Conflicts:
	upgrade_through_versions_test.py
Merge pull request #72 from riptano/custom_upgrade

Custom upgrade path from env and better debug output
remove shuffle upgrade shuffle testing
Added startup pause for windows