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Clarify sibling creation.

Siblings can be created inside Riak regardless of the `allow_mult`
setting. The previous wording implies that `allow_mult = true` must be
set.
Fix some links.

The `Reading-Data` and `Writing-Data` anchors no longer exist.
Update the LevelDB sizing spreadsheet for 1.4.
Merge pull request #646 from basho/bc-banner

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Merge pull request #650 from basho/fix-some-links

Fix some links.
adding more details on changing backends
Standardize on "indexes".

We use "indexes" as the pluralization of index throughout the docs.
Explicitly note that multiple DELETE is not supported.

Multiple object delete is part of the S3 API. Make note here that it's
not supported but planned.
Merge pull request #657 from basho/standardize-on-indexes

Standardize on "indexes".

Thanks @angrycub
Merge pull request #655 from basho/hc-14-level-spreadsheet

Update the LevelDB sizing spreadsheet for 1.4
Merge pull request #658 from basho/riakcs-clarify-multiple-delete

Explicitly note that multiple DELETE is not supported.
Merge pull request #648 from basho/clarify-siblings

Clarify sibling creation.
Merge pull request #656 from basho/changing-multi-backend

adding more details on changing backends
Merge branch 'master' into sip-of-riak