* Both `stable` and `beta` might contain extra commits for hotfixes beyond
what is currently released.
* Describe the Stable Release tag form, and point out that currently
the pre-release tag form is the same.
* Outlines everything a new contributor should know.
* There's one 'XXX' to-check items with regards to Windows Installer,
and if it does think A.B.C.1 should be installed in place of A.B.C.0.
Closes#533