use guava's Iterators class and emptyIterator
modify README.txt to add LaUD declaration
with HashCodeBuilder use toHashCode() not hashCode()
fix duplicate ip address error message
IndexHelper.skipBloomFilters won't skip non-SHA filters, part 2
patch by Carl Yeksigian; reviewed by jasobrown got CASSANDRA-5385
提交钟雨增加的列的逆排序器
Merge remote-tracking branch 'remotes/upstream/trunk' into trunk