Cassandra 2.1#1

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jivemonkey wants to merge 5 commits intojeffjirsa:cassandra-2.1from

newrelic-forks:cassandra-2.1

Commits on Dec 7, 2015

Adding the ability to give high tombstone ratio sstages compaction precdence
James King
committed

Commits on Dec 8, 2015

Removing the max tombstone ratio and rearranging the order of sstable checks
James King
committed
Merge pull request #1 from newrelic-forks/jking/add_max_tombstone
James King
committed
Adding to comments
James King
committed
Merge pull request #2 from newrelic-forks/jking/add_max_tombstone
James King
committed