.meteor/packages in new apps now contains "standard-app-packages", which implies
the standard set of packages like mongo-livedata. There is no special-casing in
initFromAppDir. This line has been added to all the examples, etc.
There's a new concept of "upgraders". "meteor run-upgrader app-packages" will
add standard-app-packages to the app, as well as all of the package in the app's
packages/ directory (an unrelated change since 0.6.4). This will be integrated
soon with "meteor update"; run-upgrader is essentially for testing.
project.add_package no longer adds packages that are already there.
This allows you to include "test helper" packages there which are only used in
test mode, as well as other internal packages which shouldn't be exported into
your app.
test-packages still tests them.
