Fix error on absence of "Mongo" symbol
Fix weak dependencies on renamed packages

The renames of packages ui -> blaze, deps -> tracker,
livedata -> ddp worked fine when a package or an app
dependened on the renamed packages. But if there was
a weak dependency (say `api.use('ui', {weak: true})`)
then:

(1) `Package.ui` would be null (since it's not in
    meteor-platform)
(2) Even if your app added 'ui' explicitly, the 'ui'
    package didn't export any symbols.
History.md for 0.9.1.1
More prep for 0.9.1.1
package version bumps for 0.9.1.1
0.9.1 -> 0.9.1.1 banner
A bunch more file updates for 0.9.1.1
Crutch for Galaxy apps

Once 04cc467582c6929097245ac58b117cb0c3739935 is released,
we can get rid of this.
bump app versions to 0.9.1.1
Merge branch 'release-0.9.1.1'

Conflicts:
	docs/.meteor/release
	docs/.meteor/versions
	docs/client/docs.js
	docs/packages/application-configuration/versions.json
	examples/clock/.meteor/release
	examples/clock/.meteor/versions
	examples/leaderboard/.meteor/release
	examples/leaderboard/.meteor/versions
	examples/parties/.meteor/release
	examples/parties/.meteor/versions
	examples/todos/.meteor/release
	examples/todos/.meteor/versions
	examples/wordplay/.meteor/release
	examples/wordplay/.meteor/versions
	scripts/admin/banners.json
	scripts/admin/manifest.json