added --cassandra-bin-dir option to specify where to search for cassandra-cli or nodetool
Merge pull request #10 from chaordic/backupschema

added --backup-schema option to backup thrift schema (cassandra-cli)
update changelog
Merge branch 'master' into build

Conflicts:
	cassandra_snapshotter/main.py
	cassandra_snapshotter/snapshotting.py