DOCS-2671: new tutorial: deploy replica set and configure authentication and authorization

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-2671: edits and structure for replica set tutorial
DOCS-2671: redirect and edit
DOCS-2671: edits to deploy replica set with auth document in response to spencer's feedback
DOCS-2671: additional clarifications for deploy repl-set auth tutorial
DOCS-2671: syntax fixes
DOCS-2671: fixing logical error in steps sequence
DOCS-2671: deploy replica set steps
DOCS-2671: improvements to the introduction of the repl-set-with-auth tutorial
DOCS-2671: changing langauge in tutorials and introductory materials
DOCS-2671: edits to avoid the localhost auth bypass
explain returns a document

explain does not return a cursor but a document with explain plan stuff.

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-3066 hint+count
trivial: rename redact tutorial
DOCS-3064 agg + sharded collections and project optimization
fixed backwards update syntax

as it was - not legal update expression.

Signed-off-by: Sam Kleinman <samk@10gen.com>
Clarify mongo shell safe write behavior in previous version
remove various blurbs regarding release candidates
add blurb on 2.6 rel notes for 2.6 release and mms 1.4
fixing link to MMS in release notes