Merge branch 'cassandra-2.1' into trunk
Switch CRC component to Adler and include it for compressed sstables
patch by Marcus Eriksson, Radovan Zvoncek, and jbellis for CASSANDRA-4165
Merge remote-tracking branch 'origin/trunk' into trunk
Merge branch 'cassandra-2.1' into trunk
add ChecksummedSequentialWriter
Merge branch 'cassandra-2.1' into trunk