(SERVER-231) Release story for 1.0.0

This commit moves the CHANGELOG into the documentation subdirectory
and renames it in concordance with the techpubs team's standards.

I also added a note to the 1.0.0 section announcing our semver
adherence and created a link to the JIRA release page.
Merge pull request #327 from ahpook/SERVER-231-release_notes_for_1_0_0

(SERVER-231) Release story for 1.0.0