Merge pull request #163 from getcwd/master

Fix typos
Update index.rst
Update Changelog-2.0.4.rst
Update Changelog-2.0.4.rst
Update Changelog-2.0.4.rst
Update Snippets.rst
Update Snippets.rst
Fix systemd link

Just changed the systemd link to a valid reStructuredText syntax.
Merge pull request #164 from BenoitZugmeyer/patch-1

Fix systemd link
Alarm: update docs to include new options