Try and explain micro marketing releases
Update the example versions
Reorganize documentation of version numbers in terms of associated releases.
Spelling.
Get rid of dangling sentence fragment.
Merge remote-tracking branch 'origin/master' into version-numbers-954
Remove 1.0 from the title
some missing words
less wordy
less wordy
Label the Major Marketing release in the examples
Move production releases section above bugfix releases
Merge pull request #955 from ClusterHQ/version-numbers-954

Updated version number policy

Author: @wallrj
Reviewers: @adamtheturtle, @exarkun 

Fixes https://clusterhq.atlassian.net/browse/FLOC-954