gluon-batman-on-wan: docs

If a given commit is not included in the master branch, the update script fails.

They aren't used by default and can simply be installed through opkg if needed.

docs: Basic site documentation
docs: Basic autoupdater documentation
docs: minimal autoupdater info
docs: bump version to 2014.2

Closes #114

Besides other issues, this should fix an integer overflow breaking IPv6 address
aquisition after a runtime of 50 days.