Gleanings from release/1.4 branch

1.4.5 was merged to develop by #817 and there are two merge commits after 1.4.5 tag:

```
$ git log --no-color --oneline --first-parent 1.4.5..origin/release/1.4
919c9ac Merge pull request #864 from basho/bugfix/cs840-fix-calc-rebased
971325b Merge pull request #818 from basho/feature/1.4.5-release-notes-update-ja
```

Because #864 was ported to develop by https://github.com/basho/riak_cs/pull/865,
only commits in #818 should be picked up.