DOCS-981 v8 change impact

DOCS-981 incorporate aaron's comments

DOCS-981 call out db specifically as no longer available in map-reduce and where

DOCS-981 V8 changes - incorporate sam's comments

DOCS-981 V8 release notes

DOCS-981 V8 release notes
DOCS-854: correction about snapshot behavior
merge: DOCS-981
DOCS-981: edits
fixing error message editing problem
DOCS-766 verify bulk inserts
DOCS-766: minor wording change
fix typo in reference/command/getLog.txt
Merge branch 'master' of git://github.com/mongodb/docs