fixes #416
Document the release schedule and versioning system.
	renamed:    docs/gettingstarted/tutorial/cleanup.rst -> docs/advanced/cleanup.rst
	modified:   docs/advanced/index.rst
	modified:   docs/gettingstarted/tutorial/index.rst
	modified:   docs/advanced/cleanup.rst
are > are to
Added to index
:ref: > :doc:
tickets > issues
which > who
Fix typo
bugfixes > bug fixes
American spelling
Pre-format instead of cite
Versioning > Version numbers
	modified:   docs/advanced/cleanup.rst
	modified:   docs/gettingstarted/tutorial/vagrant-setup.rst
	modified:   docs/advanced/cleanup.rst
	modified:   docs/advanced/cleanup.rst
Check links without anchors
Bumped version number in installers and Vagrantfiles
Address final review comments.
organizaion -> organization