doc: Updated terminology. Added librados intro to index.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Added librados introduction doc. Still wip.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Modified doc examples to use rados_create2.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Added python example of handle, and closing session examples.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
Some suggested changes, both errors and rewordings

Python and C code examples tweaked a bit

Signed-off-by: Dan Mick <dan.mick@inktank.com>
doc: Adds Python to index and sets maxdepth to 2.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Added inline literal tag.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Added Python doc.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Adds additional terms for use with librados.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Incorporated feed back from Loic and Dan.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
Merge pull request #1199 from ceph/wip-doc-librados-intro

Wip doc librados intro

Reviewed-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Loic Dachary <loic@dachary.org>