Bump package versions for 0.9.2.1.

These should have been bumped in 0.9.2
History item for 0.9.2.1
Banner for 0.9.2.1
update meteor-release-official.json for 0.9.2.1
bump more package numbers for 0.9.2.1
update manifest for 0.9.2.1
update docs
update examples to 0.9.2.1
Merge branch 'release-0.9.2.1'
Merge branch 'master' into devel