correction to maxConns text
DOCS-3286: clarification about map reduce lock during reduce phase
DOCS-3083: linking production notes rather than nav page on index file
fix header
BUMP 2.6.1
DOCS-3243: fix for https in deb repos
DOCS-3179: adding agg operator quick reference
DOCS-2933 ensureIndex options
small copy edit to last paragraph

Signed-off-by: kay <kay.kim@10gen.com>
Add explanation about date storage and range

This is the page that comes up when you google "mongodb date". The information about possible date range is now also on http://docs.mongodb.org/manual/reference/bson-types/#date, but that page is a lot harder to find. Alternatively, a link from this page to that page could be added.

Signed-off-by: kay <kay.kim@10gen.com>
DOCS-3355: comment out unused security options
Merge branch 'master' of github.com:mongodb/docs
DOCS-3362 made explicit that single ring polygons cannot self-intersect.