update the sample of storage policies section
Merge pull request #1 from intel-cloud/master

0.4.0.1
local change
changlog
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/xiaoerlyl/cosbench
add ErrorStatistics.java to count the errors appear in operations
Merge branch 'master' of https://github.com/xiaoerlyl/cosbench
conflict merge with master
nothing
Merge branch '0.4.0.1' of https://github.com/xiaoerlyl/cosbench into 0.4.0.1
error statistics
Merge pull request #197 from xiaoerlyl/0.4.0.1

add error statistics to account different error type.