Add missing license header
Save source exception in CorruptBlockException

ninja patch by Pavel Yaskevich; ninja reviewed by Aleksey Yeschenko
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.0' into cassandra-2.1.0
Merge branch 'cassandra-2.1.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk

Conflicts:
	src/java/org/apache/cassandra/io/compress/CompressedRandomAccessReader.java