Recompile .js files with new prologue.
Recompile cli
Merge branch 'master' into recompile
amber/helpers now include nil in their exports

... now that amber_vm/nil is deprecated
Merge pull request #999 from herby/recompile

Recompile .js files with new prologue.
Merge pull request #1000 from herby/nil-in-helpers-api

amber/helpers now include nil in their exports
Announce PackageDirty when a package gets dirty
Fixes AnnouncementSubscriptionTest >> testAddExtensionMethod
Removes unused package Spaces